21112490 has 32 divisors (see below), whose sum is σ = 43680384. Its totient is φ = 7197120.

The previous prime is 21112433. The next prime is 21112547. The reversal of 21112490 is 9421112.

It is an interprime number because it is at equal distance from previous prime (21112433) and next prime (21112547).

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, 13025 + ... + 14555.

It is an arithmetic number, because the mean of its divisors is an integer number (1365012).

Almost surely, 2^21112490 is an apocalyptic number.

21112490 is an abundant number, since it is smaller than the sum of its proper divisors (22567894).

21112490 is a wasteful number, since it uses less digits than its factorization.

21112490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21112490 is about 4594.8329675843. The cubic root of 21112490 is about 276.3841618829.

The spelling of 21112490 in words is "twenty-one million, one hundred twelve thousand, four hundred ninety".