21885650 has 24 divisors (see below), whose sum is σ = 42479424. Its totient is φ = 8373200.

The previous prime is 21885649. The next prime is 21885653. The reversal of 21885650 is 5658812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21885650.

It is not an unprimeable number, because it can be changed into a prime (21885653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8366 + ... + 10665.

It is an arithmetic number, because the mean of its divisors is an integer number (1769976).

Almost surely, 2^21885650 is an apocalyptic number.

21885650 is a deficient number, since it is larger than the sum of its proper divisors (20593774).

21885650 is a wasteful number, since it uses less digits than its factorization.

21885650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19066 (or 19061 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 21885650 is about 4678.2101278160. The cubic root of 21885650 is about 279.7176149652.

The spelling of 21885650 in words is "twenty-one million, eight hundred eighty-five thousand, six hundred fifty".