21924190 has 16 divisors (see below), whose sum is σ = 39528720. Its totient is φ = 8755200.

The previous prime is 21924179. The next prime is 21924197. The reversal of 21924190 is 9142912.

21924190 = 2092² + 2093² + ... + 2096².

It is a happy number.

It is a super-2 number, since 2×21924190² = 961340214312200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6265 + ... + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (2470545).

Almost surely, 2^21924190 is an apocalyptic number.

21924190 is a deficient number, since it is larger than the sum of its proper divisors (17604530).

21924190 is a wasteful number, since it uses less digits than its factorization.

21924190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21924190 is about 4682.3274127297. The cubic root of 21924190 is about 279.8817102380.

The spelling of 21924190 in words is "twenty-one million, nine hundred twenty-four thousand, one hundred ninety".