21899750 has 32 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 8700000.

The previous prime is 21899743. The next prime is 21899777. The reversal of 21899750 is 5799812.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21899698 and 21899707.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 62576 + ... + 62924.

It is an arithmetic number, because the mean of its divisors is an integer number (1289925).

Almost surely, 2^21899750 is an apocalyptic number.

21899750 is a deficient number, since it is larger than the sum of its proper divisors (19377850).

21899750 is a wasteful number, since it uses less digits than its factorization.

21899750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 21899750 is about 4679.7168717776. The cubic root of 21899750 is about 279.7776721516. Note that the first 3 decimals are identical.

The spelling of 21899750 in words is "twenty-one million, eight hundred ninety-nine thousand, seven hundred fifty".