21214490 has 16 divisors (see below), whose sum is σ = 41657760. Its totient is φ = 7714320.

The previous prime is 21214477. The next prime is 21214493. The reversal of 21214490 is 9441212.

It is not an unprimeable number, because it can be changed into a prime (21214493) 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, 96320 + ... + 96539.

It is an arithmetic number, because the mean of its divisors is an integer number (2603610).

Almost surely, 2^21214490 is an apocalyptic number.

21214490 is a deficient number, since it is larger than the sum of its proper divisors (20443270).

21214490 is a wasteful number, since it uses less digits than its factorization.

21214490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192877.

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

The square root of 21214490 is about 4605.9190179594. The cubic root of 21214490 is about 276.8285419046.

The spelling of 21214490 in words is "twenty-one million, two hundred fourteen thousand, four hundred ninety".