21892190 has 8 divisors (see below), whose sum is σ = 39405960. Its totient is φ = 8756872.

The previous prime is 21892153. The next prime is 21892201. The reversal of 21892190 is 9129812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21892190² = 958535965992200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094600 + ... + 1094619.

It is an arithmetic number, because the mean of its divisors is an integer number (4925745).

Almost surely, 2^21892190 is an apocalyptic number.

21892190 is a deficient number, since it is larger than the sum of its proper divisors (17513770).

21892190 is a wasteful number, since it uses less digits than its factorization.

21892190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189226.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 21892190 is about 4678.9090608816. The cubic root of 21892190 is about 279.7454744837.

The spelling of 21892190 in words is "twenty-one million, eight hundred ninety-two thousand, one hundred ninety".