21554950 has 12 divisors (see below), whose sum is σ = 40092300. Its totient is φ = 8621960.

The previous prime is 21554947. The next prime is 21554969. The reversal of 21554950 is 5945512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215500 + ... + 215599.

It is an arithmetic number, because the mean of its divisors is an integer number (3341025).

Almost surely, 2^21554950 is an apocalyptic number.

21554950 is a deficient number, since it is larger than the sum of its proper divisors (18537350).

21554950 is a wasteful number, since it uses less digits than its factorization.

21554950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431111 (or 431106 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 21554950 is about 4642.7308774039. The cubic root of 21554950 is about 278.3015808336.

The spelling of 21554950 in words is "twenty-one million, five hundred fifty-four thousand, nine hundred fifty".