21935625 has 20 divisors (see below), whose sum is σ = 36550800. Its totient is φ = 11698000.

The previous prime is 21935623. The next prime is 21935647. The reversal of 21935625 is 52653912.

It is not a de Polignac number, because 21935625 - 2¹ = 21935623 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21935621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3975 + ... + 7724.

It is an arithmetic number, because the mean of its divisors is an integer number (1827540).

Almost surely, 2^21935625 is an apocalyptic number.

21935625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21935625 is a deficient number, since it is larger than the sum of its proper divisors (14615175).

21935625 is an equidigital number, since it uses as much as digits as its factorization.

21935625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11722 (or 11707 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 21935625 is about 4683.5483343294. The cubic root of 21935625 is about 279.9303610829.

The spelling of 21935625 in words is "twenty-one million, nine hundred thirty-five thousand, six hundred twenty-five".