21850552 has 32 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 10367104.

The previous prime is 21850547. The next prime is 21850573. The reversal of 21850552 is 25505812.

It is a self number, because there is not a number n which added to its sum of digits gives 21850552.

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 7 ways as a sum of consecutive naturals, for example, 27018 + ... + 27814.

It is an arithmetic number, because the mean of its divisors is an integer number (1346625).

Almost surely, 2^21850552 is an apocalyptic number.

It is an amenable number.

21850552 is a deficient number, since it is larger than the sum of its proper divisors (21241448).

21850552 is a wasteful number, since it uses less digits than its factorization.

21850552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 21850552 is about 4674.4574016671. The cubic root of 21850552 is about 279.5680073205.

The spelling of 21850552 in words is "twenty-one million, eight hundred fifty thousand, five hundred fifty-two".