21572650 has 48 divisors (see below), whose sum is σ = 44559648. Its totient is φ = 7704000.

The previous prime is 21572641. The next prime is 21572653. The reversal of 21572650 is 5627512.

It is not an unprimeable number, because it can be changed into a prime (21572653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33229 + ... + 33871.

It is an arithmetic number, because the mean of its divisors is an integer number (928326).

Almost surely, 2^21572650 is an apocalyptic number.

21572650 is an abundant number, since it is smaller than the sum of its proper divisors (22986998).

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

21572650 is a wasteful number, since it uses less digits than its factorization.

21572650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21572650 is about 4644.6366919276. The cubic root of 21572650 is about 278.3777364309.

It can be divided in two parts, 21572 and 650, that added together give a palindrome (22222).

The spelling of 21572650 in words is "twenty-one million, five hundred seventy-two thousand, six hundred fifty".