21214190 has 16 divisors (see below), whose sum is σ = 38283840. Its totient is φ = 8463840.

The previous prime is 21214187. The next prime is 21214229. The reversal of 21214190 is 9141212.

It is a super-2 number, since 2×21214190² = 900083714712200, which contains 22 as substring.

It is a congruent number.

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, 1691 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (2392740).

Almost surely, 2^21214190 is an apocalyptic number.

21214190 is a deficient number, since it is larger than the sum of its proper divisors (17069650).

21214190 is a wasteful number, since it uses less digits than its factorization.

21214190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5467.

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

The square root of 21214190 is about 4605.8864510537. The cubic root of 21214190 is about 276.8272369954.

The spelling of 21214190 in words is "twenty-one million, two hundred fourteen thousand, one hundred ninety".