21488874440870 has 16 divisors (see below), whose sum is σ = 38681891389728. Its totient is φ = 8595123688320.

The previous prime is 21488874440863. The next prime is 21488874440939. The reversal of 21488874440870 is 7804447888412.

It is a junction number, because it is equal to n+sod(n) for n = 21488874440797 and 21488874440806.

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, 53049146 + ... + 53452685.

It is an arithmetic number, because the mean of its divisors is an integer number (2417618211858).

Almost surely, 2^{21488874440870} is an apocalyptic number.

21488874440870 is a deficient number, since it is larger than the sum of its proper divisors (17193016948858).

21488874440870 is a wasteful number, since it uses less digits than its factorization.

21488874440870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106522015.

The product of its (nonzero) digits is 102760448, while the sum is 65.

The spelling of 21488874440870 in words is "twenty-one trillion, four hundred eighty-eight billion, eight hundred seventy-four million, four hundred forty thousand, eight hundred seventy".