21570757671 has 8 divisors (see below), whose sum is σ = 28846355824. Its totient is φ = 14337832320.

The previous prime is 21570757657. The next prime is 21570757679. The reversal of 21570757671 is 17675707512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21570757671 - 2⁵ = 21570757639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21570757671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21570757679) 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, 10667020 + ... + 10669041.

It is an arithmetic number, because the mean of its divisors is an integer number (3605794478).

Almost surely, 2^21570757671 is an apocalyptic number.

21570757671 is a deficient number, since it is larger than the sum of its proper divisors (7275598153).

21570757671 is a wasteful number, since it uses less digits than its factorization.

21570757671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21336401.

The product of its (nonzero) digits is 720300, while the sum is 48.

The spelling of 21570757671 in words is "twenty-one billion, five hundred seventy million, seven hundred fifty-seven thousand, six hundred seventy-one".