21012031013112 has 64 divisors (see below), whose sum is σ = 58534956921600. Its totient is φ = 6983825844960.

The previous prime is 21012031013093. The next prime is 21012031013203. The reversal of 21012031013112 is 21131013021012.

21012031013112 is a `hidden beast` number, since 21 + 0 + 1 + 20 + 310 + 1 + 311 + 2 = 666.

It is a super-2 number, since 2×21012031013112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140094964 + ... + 140244867.

It is an arithmetic number, because the mean of its divisors is an integer number (914608701900).

Almost surely, 2^{21012031013112} is an apocalyptic number.

It is an amenable number.

21012031013112 is an abundant number, since it is smaller than the sum of its proper divisors (37522925908488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012031013112 is a wasteful number, since it uses less digits than its factorization.

21012031013112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280340193 (or 280340183 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21012031013112 its reverse (21131013021012), we get a palindrome (42143044034124).

The spelling of 21012031013112 in words is "twenty-one trillion, twelve billion, thirty-one million, thirteen thousand, one hundred twelve".