21914925 has 24 divisors (see below), whose sum is σ = 37009536. Its totient is φ = 11437440.

The previous prime is 21914903. The next prime is 21914927. The reversal of 21914925 is 52941912.

It is not a de Polignac number, because 21914925 - 2⁹ = 21914413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (1542064).

Almost surely, 2^21914925 is an apocalyptic number.

21914925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21914925 is a deficient number, since it is larger than the sum of its proper divisors (15094611).

21914925 is a wasteful number, since it uses less digits than its factorization.

21914925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6277 (or 6272 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 21914925 is about 4681.3379497746. The cubic root of 21914925 is about 279.8422793718.

The spelling of 21914925 in words is "twenty-one million, nine hundred fourteen thousand, nine hundred twenty-five".