21163080 has 64 divisors (see below), whose sum is σ = 65548800. Its totient is φ = 5460480.

The previous prime is 21163061. The next prime is 21163099. The reversal of 21163080 is 8036112.

It is an interprime number because it is at equal distance from previous prime (21163061) and next prime (21163099).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1024200).

Almost surely, 2^21163080 is an apocalyptic number.

21163080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21163080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32774400).

21163080 is an abundant number, since it is smaller than the sum of its proper divisors (44385720).

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

21163080 is a wasteful number, since it uses less digits than its factorization.

21163080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734 (or 5730 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21163080 is about 4600.3347704270. The cubic root of 21163080 is about 276.6047441295.

Adding to 21163080 its reverse (8036112), we get a palindrome (29199192).

The spelling of 21163080 in words is "twenty-one million, one hundred sixty-three thousand, eighty".