21570710570 has 16 divisors (see below), whose sum is σ = 38865626280. Its totient is φ = 8619762624.

The previous prime is 21570710569. The next prime is 21570710573. The reversal of 21570710570 is 7501707512.

It is a happy number.

21570710570 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2815681969 + 18755028601 = 53063^2 + 136949^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21570710570.

It is not an unprimeable number, because it can be changed into a prime (21570710573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1054565 + ... + 1074824.

Almost surely, 2^21570710570 is an apocalyptic number.

21570710570 is a deficient number, since it is larger than the sum of its proper divisors (17294915710).

21570710570 is a wasteful number, since it uses less digits than its factorization.

21570710570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130409.

The product of its (nonzero) digits is 17150, while the sum is 35.

The spelling of 21570710570 in words is "twenty-one billion, five hundred seventy million, seven hundred ten thousand, five hundred seventy".