21024568225 has 24 divisors (see below), whose sum is σ = 26519413760. Its totient is φ = 16531931520.

The previous prime is 21024568217. The next prime is 21024568247. The reversal of 21024568225 is 52286542012.

It is not a de Polignac number, because 21024568225 - 2³ = 21024568217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416557 + ... + 464293.

Almost surely, 2^21024568225 is an apocalyptic number.

21024568225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21024568225 is a deficient number, since it is larger than the sum of its proper divisors (5494845535).

21024568225 is a wasteful number, since it uses less digits than its factorization.

21024568225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48049 (or 48044 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 21024568225 in words is "twenty-one billion, twenty-four million, five hundred sixty-eight thousand, two hundred twenty-five".