21012100112012 has 6 divisors (see below), whose sum is σ = 36771175196028. Its totient is φ = 10506050056004.

The previous prime is 21012100111993. The next prime is 21012100112039. The reversal of 21012100112012 is 21021100121012.

It is a super-2 number, since 2×21012100112012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626512513998 + ... + 2626512514005.

It is an arithmetic number, because the mean of its divisors is an integer number (6128529199338).

Almost surely, 2^{21012100112012} is an apocalyptic number.

It is an amenable number.

21012100112012 is a deficient number, since it is larger than the sum of its proper divisors (15759075084016).

21012100112012 is a wasteful number, since it uses less digits than its factorization.

21012100112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253025028007 (or 5253025028005 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012100112012 its reverse (21021100121012), we get a palindrome (42033200233024).

The spelling of 21012100112012 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred twelve thousand, twelve".