21851736027 has 16 divisors (see below), whose sum is σ = 31789636608. Its totient is φ = 13241270880.

The previous prime is 21851736019. The next prime is 21851736043. The reversal of 21851736027 is 72063715812.

It is not a de Polignac number, because 21851736027 - 2³ = 21851736019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21851736027.

It is not an unprimeable number, because it can be changed into a prime (21851736007) 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, 158358 + ... + 262260.

It is an arithmetic number, because the mean of its divisors is an integer number (1986852288).

Almost surely, 2^21851736027 is an apocalyptic number.

21851736027 is a deficient number, since it is larger than the sum of its proper divisors (9937900581).

21851736027 is a wasteful number, since it uses less digits than its factorization.

21851736027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110290.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21851736027 in words is "twenty-one billion, eight hundred fifty-one million, seven hundred thirty-six thousand, twenty-seven".