21056160870 has 32 divisors (see below), whose sum is σ = 56149763040. Its totient is φ = 5614976160.

The previous prime is 21056160821. The next prime is 21056160871. The reversal of 21056160870 is 7806165012.

21056160870 is a `hidden beast` number, since 2 + 10 + 561 + 6 + 0 + 87 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056160871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38992621 + ... + 38993160.

It is an arithmetic number, because the mean of its divisors is an integer number (1754680095).

Almost surely, 2^21056160870 is an apocalyptic number.

21056160870 is an abundant number, since it is smaller than the sum of its proper divisors (35093602170).

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

21056160870 is a wasteful number, since it uses less digits than its factorization.

21056160870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77985797 (or 77985791 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 21056160870 in words is "twenty-one billion, fifty-six million, one hundred sixty thousand, eight hundred seventy".