21012111121012 has 96 divisors (see below), whose sum is σ = 41021792227584. Its totient is φ = 9337337856000.

The previous prime is 21012111121003. The next prime is 21012111121021.

21012111121012 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21012111121003) and next prime (21012111121021).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296114137 + ... + 296185087.

It is an arithmetic number, because the mean of its divisors is an integer number (427310335704).

Almost surely, 2^{21012111121012} is an apocalyptic number.

21012111121012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012111121012 is a deficient number, since it is larger than the sum of its proper divisors (20009681106572).

21012111121012 is a wasteful number, since it uses less digits than its factorization.

21012111121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71849 (or 71847 counting only the distinct ones).

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

It can be divided in two parts, 2101211 and 1121012, that added together give a palindrome (3222223).

The spelling of 21012111121012 in words is "twenty-one trillion, twelve billion, one hundred eleven million, one hundred twenty-one thousand, twelve".