21056160842 has 16 divisors (see below), whose sum is σ = 33094239552. Its totient is φ = 10028546880.

The previous prime is 21056160821. The next prime is 21056160871. The reversal of 21056160842 is 24806165012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 938588 + ... + 960759.

It is an arithmetic number, because the mean of its divisors is an integer number (2068389972).

Almost surely, 2^21056160842 is an apocalyptic number.

21056160842 is a deficient number, since it is larger than the sum of its proper divisors (12038078710).

21056160842 is a wasteful number, since it uses less digits than its factorization.

21056160842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899613.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21056160842 in words is "twenty-one billion, fifty-six million, one hundred sixty thousand, eight hundred forty-two".