21407698581475 has 6 divisors (see below), whose sum is σ = 26545546241060. Its totient is φ = 17126158865160.

The previous prime is 21407698581407. The next prime is 21407698581497. The reversal of 21407698581475 is 57418589670412.

It is not a de Polignac number, because 21407698581475 - 2²⁵ = 21407665027043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21407698581475.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 428153971605 + ... + 428153971654.

Almost surely, 2^{21407698581475} is an apocalyptic number.

21407698581475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21407698581475 is a deficient number, since it is larger than the sum of its proper divisors (5137847659585).

21407698581475 is an equidigital number, since it uses as much as digits as its factorization.

21407698581475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856307943269 (or 856307943264 counting only the distinct ones).

The product of its (nonzero) digits is 135475200, while the sum is 67.

The spelling of 21407698581475 in words is "twenty-one trillion, four hundred seven billion, six hundred ninety-eight million, five hundred eighty-one thousand, four hundred seventy-five".