21427185374 has 16 divisors (see below), whose sum is σ = 37334488416. Its totient is φ = 9032536800.

The previous prime is 21427185361. The next prime is 21427185397. The reversal of 21427185374 is 47358172412.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12544337 + ... + 12546044.

It is an arithmetic number, because the mean of its divisors is an integer number (2333405526).

Almost surely, 2^21427185374 is an apocalyptic number.

21427185374 is a deficient number, since it is larger than the sum of its proper divisors (15907303042).

21427185374 is a wasteful number, since it uses less digits than its factorization.

21427185374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25090451.

The product of its digits is 376320, while the sum is 44.

The spelling of 21427185374 in words is "twenty-one billion, four hundred twenty-seven million, one hundred eighty-five thousand, three hundred seventy-four".