21428164575 has 48 divisors (see below), whose sum is σ = 39712830240. Its totient is φ = 11327178240.

The previous prime is 21428164547. The next prime is 21428164619. The reversal of 21428164575 is 57546182412.

21428164575 is a `hidden beast` number, since 2 + 14 + 2 + 8 + 1 + 64 + 575 = 666.

It is not a de Polignac number, because 21428164575 - 2⁵ = 21428164543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21428164575.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64192 + ... + 216741.

It is an arithmetic number, because the mean of its divisors is an integer number (827350630).

Almost surely, 2^21428164575 is an apocalyptic number.

21428164575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21428164575 is a deficient number, since it is larger than the sum of its proper divisors (18284665665).

21428164575 is a wasteful number, since it uses less digits than its factorization.

21428164575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281065 (or 281054 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The spelling of 21428164575 in words is "twenty-one billion, four hundred twenty-eight million, one hundred sixty-four thousand, five hundred seventy-five".