20312013021 has 4 divisors (see below), whose sum is σ = 27082684032. Its totient is φ = 13541342012.

The previous prime is 20312013019. The next prime is 20312013079. The reversal of 20312013021 is 12031021302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20312013021 - 2¹ = 20312013019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312013121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3385335501 + ... + 3385335506.

It is an arithmetic number, because the mean of its divisors is an integer number (6770671008).

Almost surely, 2^20312013021 is an apocalyptic number.

It is an amenable number.

20312013021 is a deficient number, since it is larger than the sum of its proper divisors (6770671011).

20312013021 is an equidigital number, since it uses as much as digits as its factorization.

20312013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770671010.

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

Adding to 20312013021 its reverse (12031021302), we get a palindrome (32343034323).

The spelling of 20312013021 in words is "twenty billion, three hundred twelve million, thirteen thousand, twenty-one".