21856279112 has 16 divisors (see below), whose sum is σ = 41474265840. Its totient is φ = 10796474896.

The previous prime is 21856279111. The next prime is 21856279117. The reversal of 21856279112 is 21197265812.

It is not an unprimeable number, because it can be changed into a prime (21856279111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16457378 + ... + 16458705.

It is an arithmetic number, because the mean of its divisors is an integer number (2592141615).

Almost surely, 2^21856279112 is an apocalyptic number.

It is an amenable number.

21856279112 is a deficient number, since it is larger than the sum of its proper divisors (19617986728).

21856279112 is a wasteful number, since it uses less digits than its factorization.

21856279112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32916172 (or 32916168 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 21856279112 in words is "twenty-one billion, eight hundred fifty-six million, two hundred seventy-nine thousand, one hundred twelve".