21012020300031 has 64 divisors (see below), whose sum is σ = 29314897920000. Its totient is φ = 13370797594112.

The previous prime is 21012020300003. The next prime is 21012020300087. The reversal of 21012020300031 is 13000302021012.

It is not a de Polignac number, because 21012020300031 - 2⁹ = 21012020299519 is a prime.

It is a super-2 number, since 2×21012020300031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012020380031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1962084505 + ... + 1962095213.

It is an arithmetic number, because the mean of its divisors is an integer number (458045280000).

Almost surely, 2^{21012020300031} is an apocalyptic number.

21012020300031 is a deficient number, since it is larger than the sum of its proper divisors (8302877619969).

21012020300031 is a wasteful number, since it uses less digits than its factorization.

21012020300031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21012020300031 its reverse (13000302021012), we get a palindrome (34012322321043).

The spelling of 21012020300031 in words is "twenty-one trillion, twelve billion, twenty million, three hundred thousand, thirty-one".