21044030025 has 96 divisors (see below), whose sum is σ = 36493914240. Its totient is φ = 10690560000.

The previous prime is 21044030017. The next prime is 21044030071. The reversal of 21044030025 is 52003044012.

It is not a de Polignac number, because 21044030025 - 2³ = 21044030017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044029983 and 21044030010.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 35014725 + ... + 35015325.

It is an arithmetic number, because the mean of its divisors is an integer number (380144940).

Almost surely, 2^21044030025 is an apocalyptic number.

21044030025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21044030025 is a deficient number, since it is larger than the sum of its proper divisors (15449884215).

21044030025 is a wasteful number, since it uses less digits than its factorization.

21044030025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21044030025 its reverse (52003044012), we get a palindrome (73047074037).

The spelling of 21044030025 in words is "twenty-one billion, forty-four million, thirty thousand, twenty-five".