21193925 has 48 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 14784000.

The previous prime is 21193919. The next prime is 21193927. The reversal of 21193925 is 52939112.

It is not a de Polignac number, because 21193925 - 2²² = 16999621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21193891 and 21193900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 516905 + ... + 516945.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^21193925 is an apocalyptic number.

21193925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21193925 is a deficient number, since it is larger than the sum of its proper divisors (8804155).

21193925 is a wasteful number, since it uses less digits than its factorization.

21193925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 129 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 21193925 is about 4603.6860231775. The cubic root of 21193925 is about 276.7390618760.

The spelling of 21193925 in words is "twenty-one million, one hundred ninety-three thousand, nine hundred twenty-five".