21214090 has 16 divisors (see below), whose sum is σ = 38724480. Its totient is φ = 8365840.

The previous prime is 21214087. The next prime is 21214111. The reversal of 21214090 is 9041212.

It is a super-2 number, since 2×21214090² = 900075229056200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14230 + ... + 15649.

It is an arithmetic number, because the mean of its divisors is an integer number (2420280).

Almost surely, 2^21214090 is an apocalyptic number.

21214090 is a deficient number, since it is larger than the sum of its proper divisors (17510390).

21214090 is a wasteful number, since it uses less digits than its factorization.

21214090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29957.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21214090 is about 4605.8755953673. The cubic root of 21214090 is about 276.8268020229.

The spelling of 21214090 in words is "twenty-one million, two hundred fourteen thousand, ninety".