20879304521 has 4 divisors (see below), whose sum is σ = 20882276112. Its totient is φ = 20876332932.

The previous prime is 20879304451. The next prime is 20879304539. The reversal of 20879304521 is 12540397802.

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 20879304521 - 2¹⁸ = 20879042377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20879304821) 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, 1475231 + ... + 1489316.

It is an arithmetic number, because the mean of its divisors is an integer number (5220569028).

Almost surely, 2^20879304521 is an apocalyptic number.

It is an amenable number.

20879304521 is a deficient number, since it is larger than the sum of its proper divisors (2971591).

20879304521 is an equidigital number, since it uses as much as digits as its factorization.

20879304521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971590.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 20879304521 in words is "twenty billion, eight hundred seventy-nine million, three hundred four thousand, five hundred twenty-one".