21570318468 has 30 divisors (see below), whose sum is σ = 56389074126. Its totient is φ = 7190106048.

The previous prime is 21570318463. The next prime is 21570318479. The reversal of 21570318468 is 86481307512.

21570318468 is a `hidden beast` number, since 2 + 1 + 570 + 3 + 18 + 4 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21568447044 + 1871424 = 146862^2 + 1368^2 .

It is not an unprimeable number, because it can be changed into a prime (21570318463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33287205 + ... + 33287852.

Almost surely, 2^21570318468 is an apocalyptic number.

It is an amenable number.

21570318468 is an abundant number, since it is smaller than the sum of its proper divisors (34818755658).

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

21570318468 is a wasteful number, since it uses less digits than its factorization.

21570318468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66575073 (or 66575062 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21570318468 in words is "twenty-one billion, five hundred seventy million, three hundred eighteen thousand, four hundred sixty-eight".