20313021021 has 16 divisors (see below), whose sum is σ = 28266034560. Its totient is φ = 12951195840.

The previous prime is 20313020951. The next prime is 20313021031. The reversal of 20313021021 is 12012031302.

It is not a de Polignac number, because 20313021021 - 2¹⁰ = 20313019997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313021031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506535 + ... + 545163.

It is an arithmetic number, because the mean of its divisors is an integer number (1766627160).

Almost surely, 2^20313021021 is an apocalyptic number.

It is an amenable number.

20313021021 is a deficient number, since it is larger than the sum of its proper divisors (7953013539).

20313021021 is a wasteful number, since it uses less digits than its factorization.

20313021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46276.

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

Adding to 20313021021 its reverse (12012031302), we get a palindrome (32325052323).

The spelling of 20313021021 in words is "twenty billion, three hundred thirteen million, twenty-one thousand, twenty-one".