21738325 has 24 divisors (see below), whose sum is σ = 32622912. Its totient is φ = 14027520.

The previous prime is 21738319. The next prime is 21738329. The reversal of 21738325 is 52383712.

It is not a de Polignac number, because 21738325 - 2³ = 21738317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21738329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 679 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (1359288).

Almost surely, 2^21738325 is an apocalyptic number.

21738325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21738325 is a deficient number, since it is larger than the sum of its proper divisors (10884587).

21738325 is a wasteful number, since it uses less digits than its factorization.

21738325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341 (or 7336 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 21738325 is about 4662.4376671437. The cubic root of 21738325 is about 279.0885541710.

The spelling of 21738325 in words is "twenty-one million, seven hundred thirty-eight thousand, three hundred twenty-five".