211222111012021 has 4 divisors (see below), whose sum is σ = 222339064223200. Its totient is φ = 200105157800844.

The previous prime is 211222111011943. The next prime is 211222111012043. The reversal of 211222111012021 is 120210111222112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211222111012021 - 2³⁷ = 211084672058549 is a prime.

It is a super-2 number, since 2×211222111012021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11116953211159 = 211222111012021 / (2 + 1 + 1 + 2 + 2 + 2 + 1 + 1 + 1 + 0 + 1 + 2 + 0 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211222111012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222111312021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5558476605561 + ... + 5558476605598.

It is an arithmetic number, because the mean of its divisors is an integer number (55584766055800).

Almost surely, 2^{211222111012021} is an apocalyptic number.

It is an amenable number.

211222111012021 is a deficient number, since it is larger than the sum of its proper divisors (11116953211179).

211222111012021 is a wasteful number, since it uses less digits than its factorization.

211222111012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11116953211178.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211222111012021 its reverse (120210111222112), we get a palindrome (331432222234133).

The spelling of 211222111012021 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred eleven million, twelve thousand, twenty-one".