21575857780324 has 9 divisors (see below), whose sum is σ = 37757767373011. Its totient is φ = 10787924245180.

The previous prime is 21575857780303. The next prime is 21575857780331. The reversal of 21575857780324 is 42308775857512.

The square root of 21575857780324 is 4644982.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8128719 + ... + 10451209.

Almost surely, 2^{21575857780324} is an apocalyptic number.

21575857780324 is the 4644982-nd square number.

It is an amenable number.

21575857780324 is a deficient number, since it is larger than the sum of its proper divisors (16181909592687).

21575857780324 is an frugal number, since it uses more digits than its factorization.

21575857780324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644986 (or 2322493 counting only the distinct ones).

The product of its (nonzero) digits is 131712000, while the sum is 64.

The spelling of 21575857780324 in words is "twenty-one trillion, five hundred seventy-five billion, eight hundred fifty-seven million, seven hundred eighty thousand, three hundred twenty-four".