21513130 has 16 divisors (see below), whose sum is σ = 40762080. Its totient is φ = 8152272.

The previous prime is 21513127. The next prime is 21513161. The reversal of 21513130 is 3131512.

21513130 is nontrivially palindromic in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56424 + ... + 56803.

It is an arithmetic number, because the mean of its divisors is an integer number (2547630).

Almost surely, 2^21513130 is an apocalyptic number.

21513130 is a deficient number, since it is larger than the sum of its proper divisors (19248950).

21513130 is a wasteful number, since it uses less digits than its factorization.

21513130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113253.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21513130 is about 4638.2248759628. The cubic root of 21513130 is about 278.1214813341.

Adding to 21513130 its reverse (3131512), we get a palindrome (24644642).

The spelling of 21513130 in words is "twenty-one million, five hundred thirteen thousand, one hundred thirty".