21103963425 has 48 divisors (see below), whose sum is σ = 39047848000. Its totient is φ = 11174423040.

The previous prime is 21103963409. The next prime is 21103963459. The reversal of 21103963425 is 52436930112.

21103963425 is a `hidden beast` number, since 2 + 1 + 10 + 3 + 9 + 634 + 2 + 5 = 666.

It is not a de Polignac number, because 21103963425 - 2⁴ = 21103963409 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103963425.

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, 18640 + ... + 206289.

Almost surely, 2^21103963425 is an apocalyptic number.

21103963425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21103963425 is a deficient number, since it is larger than the sum of its proper divisors (17943884575).

21103963425 is a wasteful number, since it uses less digits than its factorization.

21103963425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225087 (or 225076 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21103963425 in words is "twenty-one billion, one hundred three million, nine hundred sixty-three thousand, four hundred twenty-five".