21412490 has 16 divisors (see below), whose sum is σ = 42046560. Its totient is φ = 7786320.

The previous prime is 21412451. The next prime is 21412493. The reversal of 21412490 is 9421412.

It is not an unprimeable number, because it can be changed into a prime (21412493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97220 + ... + 97439.

It is an arithmetic number, because the mean of its divisors is an integer number (2627910).

Almost surely, 2^21412490 is an apocalyptic number.

21412490 is a deficient number, since it is larger than the sum of its proper divisors (20634070).

21412490 is a wasteful number, since it uses less digits than its factorization.

21412490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194677.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21412490 is about 4627.3631800411. The cubic root of 21412490 is about 277.6871123956.

The spelling of 21412490 in words is "twenty-one million, four hundred twelve thousand, four hundred ninety".