21112021022012 has 12 divisors (see below), whose sum is σ = 37057656237336. Its totient is φ = 10524119239920.

The previous prime is 21112021022011. The next prime is 21112021022069. The reversal of 21112021022012 is 21022012021112.

It is a super-2 number, since 2×21112021022012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112021022011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7972816283 + ... + 7972818930.

It is an arithmetic number, because the mean of its divisors is an integer number (3088138019778).

Almost surely, 2^{21112021022012} is an apocalyptic number.

It is an amenable number.

21112021022012 is a deficient number, since it is larger than the sum of its proper divisors (15945635215324).

21112021022012 is a wasteful number, since it uses less digits than its factorization.

21112021022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15945635548 (or 15945635546 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112021022012 its reverse (21022012021112), we get a palindrome (42134033043124).

The spelling of 21112021022012 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, twenty-two thousand, twelve".