21132025 has 12 divisors (see below), whose sum is σ = 26284032. Its totient is φ = 16853840.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132025 is 52023112.

It is not a de Polignac number, because 21132025 - 2⁷ = 21131897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8472 + ... + 10678.

It is an arithmetic number, because the mean of its divisors is an integer number (2190336).

Almost surely, 2^21132025 is an apocalyptic number.

21132025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21132025 is a deficient number, since it is larger than the sum of its proper divisors (5152007).

21132025 is a wasteful number, since it uses less digits than its factorization.

21132025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21132025 is about 4596.9582334409. The cubic root of 21132025 is about 276.4693800043.

Adding to 21132025 its reverse (52023112), we get a palindrome (73155137).

The spelling of 21132025 in words is "twenty-one million, one hundred thirty-two thousand, twenty-five".