212211211111021 has 16 divisors (see below), whose sum is σ = 213148211148288. Its totient is φ = 211275570844800.

The previous prime is 212211211110979. The next prime is 212211211111037. The reversal of 212211211111021 is 120111112112212.

It is a cyclic number.

It is not a de Polignac number, because 212211211111021 - 2³⁹ = 211661455297133 is a prime.

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 212211211111021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211211411021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762037676 + ... + 1762158106.

It is an arithmetic number, because the mean of its divisors is an integer number (13321763196768).

Almost surely, 2^{212211211111021} is an apocalyptic number.

It is an amenable number.

212211211111021 is a deficient number, since it is larger than the sum of its proper divisors (937000037267).

212211211111021 is a wasteful number, since it uses less digits than its factorization.

212211211111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126012.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 212211211111021 its reverse (120111112112212), we get a palindrome (332322323223233).

The spelling of 212211211111021 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, twenty-one".