21111122012012 has 6 divisors (see below), whose sum is σ = 36944463521028. Its totient is φ = 10555561006004.

The previous prime is 21111122012011. The next prime is 21111122012039. The reversal of 21111122012012 is 21021022111112.

It is not an unprimeable number, because it can be changed into a prime (21111122012011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638890251498 + ... + 2638890251505.

It is an arithmetic number, because the mean of its divisors is an integer number (6157410586838).

Almost surely, 2^{21111122012012} is an apocalyptic number.

It is an amenable number.

21111122012012 is a deficient number, since it is larger than the sum of its proper divisors (15833341509016).

21111122012012 is a wasteful number, since it uses less digits than its factorization.

21111122012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277780503007 (or 5277780503005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111122012012 its reverse (21021022111112), we get a palindrome (42132144123124).

The spelling of 21111122012012 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, twelve thousand, twelve".