212021122111221 has 32 divisors (see below), whose sum is σ = 293656484160000. Its totient is φ = 135908210692800.

The previous prime is 212021122111217. The next prime is 212021122111229. The reversal of 212021122111221 is 122111221120212.

It is not a de Polignac number, because 212021122111221 - 2² = 212021122111217 is a prime.

It is a super-2 number, since 2×212021122111221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021122111229) 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 31 ways as a sum of consecutive naturals, for example, 15044946 + ... + 25502796.

It is an arithmetic number, because the mean of its divisors is an integer number (9176765130000).

Almost surely, 2^{212021122111221} is an apocalyptic number.

It is an amenable number.

212021122111221 is a deficient number, since it is larger than the sum of its proper divisors (81635362048779).

212021122111221 is a wasteful number, since it uses less digits than its factorization.

212021122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458849.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212021122111221 its reverse (122111221120212), we get a palindrome (334132343231433).

The spelling of 212021122111221 in words is "two hundred twelve trillion, twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".