20937421959 has 4 divisors (see below), whose sum is σ = 27916562616. Its totient is φ = 13958281304.

The previous prime is 20937421951. The next prime is 20937421993. The reversal of 20937421959 is 95912473902.

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

It is a cyclic number.

It is not a de Polignac number, because 20937421959 - 2³ = 20937421951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937421951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3489570324 + ... + 3489570329.

It is an arithmetic number, because the mean of its divisors is an integer number (6979140654).

Almost surely, 2^20937421959 is an apocalyptic number.

20937421959 is a deficient number, since it is larger than the sum of its proper divisors (6979140657).

20937421959 is an equidigital number, since it uses as much as digits as its factorization.

20937421959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6979140656.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 20937421959 in words is "twenty billion, nine hundred thirty-seven million, four hundred twenty-one thousand, nine hundred fifty-nine".