21313110 has 128 divisors (see below), whose sum is σ = 64963584. Its totient is φ = 4354560.

The previous prime is 21313093. The next prime is 21313129. The reversal of 21313110 is 1131312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100905 + ... + 101115.

It is an arithmetic number, because the mean of its divisors is an integer number (507528).

Almost surely, 2^21313110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32481792).

21313110 is an abundant number, since it is smaller than the sum of its proper divisors (43650474).

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

21313110 is a wasteful number, since it uses less digits than its factorization.

21313110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21313110 is about 4616.6123943862. The cubic root of 21313110 is about 277.2568440569.

Adding to 21313110 its reverse (1131312), we get a palindrome (22444422).

The spelling of 21313110 in words is "twenty-one million, three hundred thirteen thousand, one hundred ten".