21370110 has 32 divisors (see below), whose sum is σ = 51410592. Its totient is φ = 5685120.

The previous prime is 21370109. The next prime is 21370133. The reversal of 21370110 is 1107312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21370110.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22240 + ... + 23180.

It is an arithmetic number, because the mean of its divisors is an integer number (1606581).

Almost surely, 2^21370110 is an apocalyptic number.

21370110 is an abundant number, since it is smaller than the sum of its proper divisors (30040482).

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

21370110 is a wasteful number, since it uses less digits than its factorization.

21370110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 21370110 is about 4622.7816301443. The cubic root of 21370110 is about 277.5037902250.

Adding to 21370110 its reverse (1107312), we get a palindrome (22477422).

The spelling of 21370110 in words is "twenty-one million, three hundred seventy thousand, one hundred ten".