21387474582 has 16 divisors (see below), whose sum is σ = 42791226480. Its totient is φ = 7126445312.

The previous prime is 21387474569. The next prime is 21387474593. The reversal of 21387474582 is 28547478312.

It is a happy 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, 661107 + ... + 692702.

It is an arithmetic number, because the mean of its divisors is an integer number (2674451655).

Almost surely, 2^21387474582 is an apocalyptic number.

21387474582 is an abundant number, since it is smaller than the sum of its proper divisors (21403751898).

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

21387474582 is a wasteful number, since it uses less digits than its factorization.

21387474582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356447.

The product of its digits is 3010560, while the sum is 51.

The spelling of 21387474582 in words is "twenty-one billion, three hundred eighty-seven million, four hundred seventy-four thousand, five hundred eighty-two".