21903950 has 24 divisors (see below), whose sum is σ = 40912560. Its totient is φ = 8724800.

The previous prime is 21903943. The next prime is 21903983. The reversal of 21903950 is 5930912.

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 11 ways as a sum of consecutive naturals, for example, 13271 + ... + 14829.

It is an arithmetic number, because the mean of its divisors is an integer number (1704690).

Almost surely, 2^21903950 is an apocalyptic number.

21903950 is a deficient number, since it is larger than the sum of its proper divisors (19008610).

21903950 is a wasteful number, since it uses less digits than its factorization.

21903950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 21903950 is about 4680.1655953609. The cubic root of 21903950 is about 279.7955565432.

The spelling of 21903950 in words is "twenty-one million, nine hundred three thousand, nine hundred fifty".