21632025 has 12 divisors (see below), whose sum is σ = 35765072. Its totient is φ = 11537040.

The previous prime is 21631997. The next prime is 21632059. The reversal of 21632025 is 52023612.

It is not a de Polignac number, because 21632025 - 2⁵ = 21631993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21631992 and 21632010.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144139 + ... + 144288.

Almost surely, 2^21632025 is an apocalyptic number.

21632025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21632025 is a deficient number, since it is larger than the sum of its proper divisors (14133047).

21632025 is a wasteful number, since it uses less digits than its factorization.

21632025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288440 (or 288435 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21632025 is about 4651.0240807805. The cubic root of 21632025 is about 278.6328980535.

Adding to 21632025 its reverse (52023612), we get a palindrome (73655637).

The spelling of 21632025 in words is "twenty-one million, six hundred thirty-two thousand, twenty-five".