21325160 has 16 divisors (see below), whose sum is σ = 47981700. Its totient is φ = 8530048.

The previous prime is 21325151. The next prime is 21325177. The reversal of 21325160 is 6152312.

It can be written as a sum of positive squares in 2 ways, for example, as 21031396 + 293764 = 4586^2 + 542^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266525 + ... + 266604.

Almost surely, 2^21325160 is an apocalyptic number.

21325160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21325160 is an abundant number, since it is smaller than the sum of its proper divisors (26656540).

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

21325160 is a wasteful number, since it uses less digits than its factorization.

21325160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533140 (or 533136 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21325160 is about 4617.9172794670. The cubic root of 21325160 is about 277.3090860109.

Adding to 21325160 its reverse (6152312), we get a palindrome (27477472).

It can be divided in two parts, 21 and 325160, that multiplied together give a triangular number (6828360 = T₃₆₉₅).

The spelling of 21325160 in words is "twenty-one million, three hundred twenty-five thousand, one hundred sixty".