21044534025 has 48 divisors (see below), whose sum is σ = 35123624960. Its totient is φ = 11117736000.

The previous prime is 21044534009. The next prime is 21044534051. The reversal of 21044534025 is 52043544012.

It is not a de Polignac number, because 21044534025 - 2⁴ = 21044534009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044533983 and 21044534001.

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, 4289724 + ... + 4294626.

Almost surely, 2^21044534025 is an apocalyptic number.

21044534025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21044534025 is a deficient number, since it is larger than the sum of its proper divisors (14079090935).

21044534025 is a wasteful number, since it uses less digits than its factorization.

21044534025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5446 (or 5441 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21044534025 in words is "twenty-one billion, forty-four million, five hundred thirty-four thousand, twenty-five".