31021203013 has 4 divisors (see below), whose sum is σ = 31021676620. Its totient is φ = 31020729408.

The previous prime is 31021202969. The next prime is 31021203023. The reversal of 31021203013 is 31030212013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28568774529 + 2452428484 = 169023^2 + 49522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31021203013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021203023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119028 + ... + 276061.

It is an arithmetic number, because the mean of its divisors is an integer number (7755419155).

Almost surely, 2^31021203013 is an apocalyptic number.

It is an amenable number.

31021203013 is a deficient number, since it is larger than the sum of its proper divisors (473607).

31021203013 is an equidigital number, since it uses as much as digits as its factorization.

31021203013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473606.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31021203013 its reverse (31030212013), we get a palindrome (62051415026).

The spelling of 31021203013 in words is "thirty-one billion, twenty-one million, two hundred three thousand, thirteen".