31203020130021 has 28 divisors (see below), whose sum is σ = 46924468067680. Its totient is φ = 20739167297640.

The previous prime is 31203020130017. The next prime is 31203020130041. The reversal of 31203020130021 is 12003102030213.

31203020130021 is a `hidden beast` number, since 312 + 0 + 30 + 2 + 0 + 1 + 300 + 21 = 666.

It is not a de Polignac number, because 31203020130021 - 2² = 31203020130017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31203020129976 and 31203020130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203020130041) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 64415041 + ... + 64897638.

It is an arithmetic number, because the mean of its divisors is an integer number (1675873859560).

Almost surely, 2^{31203020130021} is an apocalyptic number.

It is an amenable number.

31203020130021 is a deficient number, since it is larger than the sum of its proper divisors (15721447937659).

31203020130021 is an equidigital number, since it uses as much as digits as its factorization.

31203020130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129313028 (or 129313013 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31203020130021 its reverse (12003102030213), we get a palindrome (43206122160234).

The spelling of 31203020130021 in words is "thirty-one trillion, two hundred three billion, twenty million, one hundred thirty thousand, twenty-one".