21031203120012 has 36 divisors (see below), whose sum is σ = 53358378420256. Its totient is φ = 6984532398240.

The previous prime is 21031203120001. The next prime is 21031203120127. The reversal of 21031203120012 is 21002130213012.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077850183 + ... + 1077869694.

Almost surely, 2^{21031203120012} is an apocalyptic number.

It is an amenable number.

21031203120012 is an abundant number, since it is smaller than the sum of its proper divisors (32327175300244).

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

21031203120012 is a wasteful number, since it uses less digits than its factorization.

21031203120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155720158 (or 2155720153 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21031203120012 its reverse (21002130213012), we get a palindrome (42033333333024).

The spelling of 21031203120012 in words is "twenty-one trillion, thirty-one billion, two hundred three million, one hundred twenty thousand, twelve".