21052867600 has 30 divisors (see below), whose sum is σ = 50579515370. Its totient is φ = 8421146880.

The previous prime is 21052867573. The next prime is 21052867613. The reversal of 21052867600 is 676825012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 127509264 + 20925358336 = 11292^2 + 144656^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21052867600.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26315685 + ... + 26316484.

Almost surely, 2^21052867600 is an apocalyptic number.

21052867600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21052867600 is an abundant number, since it is smaller than the sum of its proper divisors (29526647770).

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

21052867600 is a wasteful number, since it uses less digits than its factorization.

21052867600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52632187 (or 52632176 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21052867600 in words is "twenty-one billion, fifty-two million, eight hundred sixty-seven thousand, six hundred".