21613160 has 32 divisors (see below), whose sum is σ = 48867840. Its totient is φ = 8602944.

The previous prime is 21613157. The next prime is 21613177. The reversal of 21613160 is 6131612.

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 7 ways as a sum of consecutive naturals, for example, 7709 + ... + 10131.

It is an arithmetic number, because the mean of its divisors is an integer number (1527120).

Almost surely, 2^21613160 is an apocalyptic number.

21613160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21613160 is an abundant number, since it is smaller than the sum of its proper divisors (27254680).

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

21613160 is a wasteful number, since it uses less digits than its factorization.

21613160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2653 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21613160 is about 4648.9955904475. The cubic root of 21613160 is about 278.5518771539.

Adding to 21613160 its reverse (6131612), we get a palindrome (27744772).

The spelling of 21613160 in words is "twenty-one million, six hundred thirteen thousand, one hundred sixty".