21735236874 has 16 divisors (see below), whose sum is σ = 46814356512. Its totient is φ = 6687765168.

The previous prime is 21735236867. The next prime is 21735236891. The reversal of 21735236874 is 47863253712.

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, 139328364 + ... + 139328519.

It is an arithmetic number, because the mean of its divisors is an integer number (2925897282).

Almost surely, 2^21735236874 is an apocalyptic number.

21735236874 is an abundant number, since it is smaller than the sum of its proper divisors (25079119638).

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

21735236874 is a wasteful number, since it uses less digits than its factorization.

21735236874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278656901.

The product of its digits is 1693440, while the sum is 48.

The spelling of 21735236874 in words is "twenty-one billion, seven hundred thirty-five million, two hundred thirty-six thousand, eight hundred seventy-four".