21570559670 has 16 divisors (see below), whose sum is σ = 42356735568. Its totient is φ = 7843839840.

The previous prime is 21570559669. The next prime is 21570559679. The reversal of 21570559670 is 7695507512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21570559679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98047889 + ... + 98048108.

It is an arithmetic number, because the mean of its divisors is an integer number (2647295973).

Almost surely, 2^21570559670 is an apocalyptic number.

21570559670 is a deficient number, since it is larger than the sum of its proper divisors (20786175898).

21570559670 is a wasteful number, since it uses less digits than its factorization.

21570559670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196096015.

The product of its (nonzero) digits is 661500, while the sum is 47.

The spelling of 21570559670 in words is "twenty-one billion, five hundred seventy million, five hundred fifty-nine thousand, six hundred seventy".