21329625 has 32 divisors (see below), whose sum is σ = 37050624. Its totient is φ = 10876800.

The previous prime is 21329603. The next prime is 21329629. The reversal of 21329625 is 52692312.

It is not a de Polignac number, because 21329625 - 2¹⁴ = 21313241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21329592 and 21329601.

It is not an unprimeable number, because it can be changed into a prime (21329629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7389 + ... + 9861.

It is an arithmetic number, because the mean of its divisors is an integer number (1157832).

Almost surely, 2^21329625 is an apocalyptic number.

21329625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21329625 is a deficient number, since it is larger than the sum of its proper divisors (15720999).

21329625 is a wasteful number, since it uses less digits than its factorization.

21329625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514 (or 2504 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 21329625 is about 4618.4006972111. The cubic root of 21329625 is about 277.3284387170.

The spelling of 21329625 in words is "twenty-one million, three hundred twenty-nine thousand, six hundred twenty-five".