211222222222021 has 4 divisors (see below), whose sum is σ = 211222350562444. Its totient is φ = 211222093881600.

The previous prime is 211222222222019. The next prime is 211222222222027. The reversal of 211222222222021 is 120222222222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110384756152225 + 100837466069796 = 10506415^2 + 10041786^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222222222021 - 2¹ = 211222222222019 is a prime.

It is a super-2 number, since 2×211222222222021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222222222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61669020 + ... + 65003941.

It is an arithmetic number, because the mean of its divisors is an integer number (52805587640611).

Almost surely, 2^{211222222222021} is an apocalyptic number.

It is an amenable number.

211222222222021 is a deficient number, since it is larger than the sum of its proper divisors (128340423).

211222222222021 is a wasteful number, since it uses less digits than its factorization.

211222222222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128340422.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 211222222222021 its reverse (120222222222112), we get a palindrome (331444444444133).

Subtracting from 211222222222021 its reverse (120222222222112), we obtain a palindrome (90999999999909).

The spelling of 211222222222021 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".