21594712374 has 64 divisors (see below), whose sum is σ = 50382374400. Its totient is φ = 6842965536.

The previous prime is 21594712361. The next prime is 21594712429. The reversal of 21594712374 is 47321749512.

21594712374 is a `hidden beast` number, since 2 + 159 + 471 + 23 + 7 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149112 + ... + 255780.

It is an arithmetic number, because the mean of its divisors is an integer number (787224600).

Almost surely, 2^21594712374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21594712374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25191187200).

21594712374 is an abundant number, since it is smaller than the sum of its proper divisors (28787662026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21594712374 is a wasteful number, since it uses less digits than its factorization.

21594712374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106866 (or 106860 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 21594712374 in words is "twenty-one billion, five hundred ninety-four million, seven hundred twelve thousand, three hundred seventy-four".