21332025 has 144 divisors (see below), whose sum is σ = 49014720. Its totient is φ = 8985600.

The previous prime is 21332009. The next prime is 21332029. The reversal of 21332025 is 52023312.

21332025 = 63² + 64² + ... + 400².

It is not a de Polignac number, because 21332025 - 2⁴ = 21332009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331989 and 21332007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332029) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1254817 + ... + 1254833.

It is an arithmetic number, because the mean of its divisors is an integer number (340380).

Almost surely, 2^21332025 is an apocalyptic number.

21332025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21332025 is an abundant number, since it is smaller than the sum of its proper divisors (27682695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21332025 is a wasteful number, since it uses less digits than its factorization.

21332025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21332025 is about 4618.6605201075. The cubic root of 21332025 is about 277.3388399514.

Adding to 21332025 its reverse (52023312), we get a palindrome (73355337).

The spelling of 21332025 in words is "twenty-one million, three hundred thirty-two thousand, twenty-five".