21850021937 has 8 divisors (see below), whose sum is σ = 22154545056. Its totient is φ = 21545639712.

The previous prime is 21850021931. The next prime is 21850021969. The reversal of 21850021937 is 73912005812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21850021937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21850021937.

It is not an unprimeable number, because it can be changed into a prime (21850021931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299018 + ... + 364844.

It is an arithmetic number, because the mean of its divisors is an integer number (2769318132).

Almost surely, 2^21850021937 is an apocalyptic number.

It is an amenable number.

21850021937 is a deficient number, since it is larger than the sum of its proper divisors (304523119).

21850021937 is an equidigital number, since it uses as much as digits as its factorization.

21850021937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70447.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21850021937 in words is "twenty-one billion, eight hundred fifty million, twenty-one thousand, nine hundred thirty-seven".