21575050 has 24 divisors (see below), whose sum is σ = 45863136. Its totient is φ = 7397040.

The previous prime is 21575041. The next prime is 21575053. The reversal of 21575050 is 5057512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21575053) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 30472 + ... + 31171.

It is an arithmetic number, because the mean of its divisors is an integer number (1910964).

Almost surely, 2^21575050 is an apocalyptic number.

21575050 is an abundant number, since it is smaller than the sum of its proper divisors (24288086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21575050 is a wasteful number, since it uses less digits than its factorization.

21575050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61662 (or 61657 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 21575050 is about 4644.8950472535. The cubic root of 21575050 is about 278.3880594061.

The spelling of 21575050 in words is "twenty-one million, five hundred seventy-five thousand, fifty".