21900950 has 24 divisors (see below), whose sum is σ = 40858992. Its totient is φ = 8733920.

The previous prime is 21900937. The next prime is 21900953. The reversal of 21900950 is 5900912.

It is a happy number.

It is a super-2 number, since 2×21900950² = 959303221805000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900953) 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 11 ways as a sum of consecutive naturals, for example, 32012 + ... + 32688.

It is an arithmetic number, because the mean of its divisors is an integer number (1702458).

Almost surely, 2^21900950 is an apocalyptic number.

21900950 is a deficient number, since it is larger than the sum of its proper divisors (18958042).

21900950 is a wasteful number, since it uses less digits than its factorization.

21900950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 21900950 is about 4679.8450829061. The cubic root of 21900950 is about 279.7827822111.

The spelling of 21900950 in words is "twenty-one million, nine hundred thousand, nine hundred fifty".