20313012021 has 4 divisors (see below), whose sum is σ = 27084016032. Its totient is φ = 13542008012.

The previous prime is 20313012011. The next prime is 20313012029. The reversal of 20313012021 is 12021031302.

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 20313012021 - 2¹⁷ = 20312880949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313012029) 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, 3385502001 + ... + 3385502006.

It is an arithmetic number, because the mean of its divisors is an integer number (6771004008).

Almost surely, 2^20313012021 is an apocalyptic number.

It is an amenable number.

20313012021 is a deficient number, since it is larger than the sum of its proper divisors (6771004011).

20313012021 is an equidigital number, since it uses as much as digits as its factorization.

20313012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771004010.

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

Adding to 20313012021 its reverse (12021031302), we get a palindrome (32334043323).

The spelling of 20313012021 in words is "twenty billion, three hundred thirteen million, twelve thousand, twenty-one".