21924986 has 16 divisors (see below), whose sum is σ = 34584840. Its totient is φ = 10409280.

The previous prime is 21924971. The next prime is 21924997. The reversal of 21924986 is 68942912.

It can be written as a sum of positive squares in 4 ways, for example, as 12033961 + 9891025 = 3469^2 + 3145^2 .

It is a super-2 number, since 2×21924986² = 961410022200392, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 440 + ... + 6636.

Almost surely, 2^21924986 is an apocalyptic number.

21924986 is a deficient number, since it is larger than the sum of its proper divisors (12659854).

21924986 is a wasteful number, since it uses less digits than its factorization.

21924986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6289.

The product of its digits is 62208, while the sum is 41.

The square root of 21924986 is about 4682.4124124216. The cubic root of 21924986 is about 279.8850974121.

The spelling of 21924986 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred eighty-six".