21385650937 has 16 divisors (see below), whose sum is σ = 24699580672. Its totient is φ = 18136742400.

The previous prime is 21385650919. The next prime is 21385650943. The reversal of 21385650937 is 73905658312.

It is a de Polignac number, because none of the positive numbers 2^k-21385650937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21385650947) 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, 853573 + ... + 878269.

It is an arithmetic number, because the mean of its divisors is an integer number (1543723792).

Almost surely, 2^21385650937 is an apocalyptic number.

It is an amenable number.

21385650937 is a deficient number, since it is larger than the sum of its proper divisors (3313929735).

21385650937 is a wasteful number, since it uses less digits than its factorization.

21385650937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26008.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 21385650937 in words is "twenty-one billion, three hundred eighty-five million, six hundred fifty thousand, nine hundred thirty-seven".