21739325 has 12 divisors (see below), whose sum is σ = 28376160. Its totient is φ = 16475760.

The previous prime is 21739321. The next prime is 21739351. The reversal of 21739325 is 52393712.

It is not a de Polignac number, because 21739325 - 2² = 21739321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21739291 and 21739300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22409 + ... + 23358.

It is an arithmetic number, because the mean of its divisors is an integer number (2364680).

Almost surely, 2^21739325 is an apocalyptic number.

21739325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21739325 is a deficient number, since it is larger than the sum of its proper divisors (6636835).

21739325 is a wasteful number, since it uses less digits than its factorization.

21739325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45796 (or 45791 counting only the distinct ones).

The product of its digits is 11340, while the sum is 32.

The square root of 21739325 is about 4662.5449059500. The cubic root of 21739325 is about 279.0928336218.

The spelling of 21739325 in words is "twenty-one million, seven hundred thirty-nine thousand, three hundred twenty-five".