21164612570 has 16 divisors (see below), whose sum is σ = 40337261928. Its totient is φ = 7967854080.

The previous prime is 21164612549. The next prime is 21164612593. The reversal of 21164612570 is 7521646112.

It can be written as a sum of positive squares in 4 ways, for example, as 15752509081 + 5412103489 = 125509^2 + 73567^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21164612570.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62248691 + ... + 62249030.

Almost surely, 2^21164612570 is an apocalyptic number.

21164612570 is a deficient number, since it is larger than the sum of its proper divisors (19172649358).

21164612570 is a wasteful number, since it uses less digits than its factorization.

21164612570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124497745.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21164612570 in words is "twenty-one billion, one hundred sixty-four million, six hundred twelve thousand, five hundred seventy".