21573613250 has 64 divisors (see below), whose sum is σ = 46189668096. Its totient is φ = 7391145600.

The previous prime is 21573613247. The next prime is 21573613319. The reversal of 21573613250 is 5231637512.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21573613250.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2843462 + ... + 2851038.

It is an arithmetic number, because the mean of its divisors is an integer number (721713564).

Almost surely, 2^21573613250 is an apocalyptic number.

21573613250 is an abundant number, since it is smaller than the sum of its proper divisors (24616054846).

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

21573613250 is a wasteful number, since it uses less digits than its factorization.

21573613250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9228 (or 9218 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 21573613250 in words is "twenty-one billion, five hundred seventy-three million, six hundred thirteen thousand, two hundred fifty".