21653455425 has 48 divisors (see below), whose sum is σ = 42020560512. Its totient is φ = 9631180800.

The previous prime is 21653455379. The next prime is 21653455429. The reversal of 21653455425 is 52455435612.

It is not a de Polignac number, because 21653455425 - 2⁹ = 21653454913 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21653455429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 537936 + ... + 576785.

It is an arithmetic number, because the mean of its divisors is an integer number (875428344).

Almost surely, 2^21653455425 is an apocalyptic number.

21653455425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21653455425 is a deficient number, since it is larger than the sum of its proper divisors (20367105087).

21653455425 is a wasteful number, since it uses less digits than its factorization.

21653455425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114778 (or 1114773 counting only the distinct ones).

The product of its digits is 720000, while the sum is 42.

The spelling of 21653455425 in words is "twenty-one billion, six hundred fifty-three million, four hundred fifty-five thousand, four hundred twenty-five".