21385382574 has 16 divisors (see below), whose sum is σ = 42778691280. Its totient is φ = 7127139840.

The previous prime is 21385382537. The next prime is 21385382593. The reversal of 21385382574 is 47528358312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294889 + ... + 360180.

It is an arithmetic number, because the mean of its divisors is an integer number (2673668205).

Almost surely, 2^21385382574 is an apocalyptic number.

21385382574 is an abundant number, since it is smaller than the sum of its proper divisors (21393308706).

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

21385382574 is a wasteful number, since it uses less digits than its factorization.

21385382574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660515.

The product of its digits is 1612800, while the sum is 48.

The spelling of 21385382574 in words is "twenty-one billion, three hundred eighty-five million, three hundred eighty-two thousand, five hundred seventy-four".