421564055825 has 24 divisors (see below), whose sum is σ = 572818503936. Its totient is φ = 305217144000.

The previous prime is 421564055819. The next prime is 421564055827. The reversal of 421564055825 is 528550465124.

It is not a de Polignac number, because 421564055825 - 2⁸ = 421564055569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421564055825.

It is not an unprimeable number, because it can be changed into a prime (421564055827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3375806 + ... + 3498455.

It is an arithmetic number, because the mean of its divisors is an integer number (23867437664).

Almost surely, 2^421564055825 is an apocalyptic number.

It is an amenable number.

421564055825 is a deficient number, since it is larger than the sum of its proper divisors (151254448111).

421564055825 is a wasteful number, since it uses less digits than its factorization.

421564055825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874505 (or 6874500 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 47.

The spelling of 421564055825 in words is "four hundred twenty-one billion, five hundred sixty-four million, fifty-five thousand, eight hundred twenty-five".