211211111012021 has 8 divisors (see below), whose sum is σ = 214577480176704. Its totient is φ = 207855618647040.

The previous prime is 211211111011963. The next prime is 211211111012023. The reversal of 211211111012021 is 120210111112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211211111012021 - 2¹⁰ = 211211111010997 is a prime.

It is a super-2 number, since 2×211211111012021² (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 (211211111012023) 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 7 ways as a sum of consecutive naturals, for example, 2719160780 + ... + 2719238453.

It is an arithmetic number, because the mean of its divisors is an integer number (26822185022088).

Almost surely, 2^{211211111012021} is an apocalyptic number.

It is an amenable number.

211211111012021 is a deficient number, since it is larger than the sum of its proper divisors (3366369164683).

211211111012021 is an equidigital number, since it uses as much as digits as its factorization.

211211111012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438399851.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211211111012021 its reverse (120210111112112), we get a palindrome (331421222124133).

The spelling of 211211111012021 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, twelve thousand, twenty-one".