21864863112 has 64 divisors (see below), whose sum is σ = 55121299200. Its totient is φ = 7227155520.

The previous prime is 21864863099. The next prime is 21864863143. The reversal of 21864863112 is 21136846812.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7754839 + ... + 7757657.

It is an arithmetic number, because the mean of its divisors is an integer number (861270300).

Almost surely, 2^21864863112 is an apocalyptic number.

It is an amenable number.

21864863112 is an abundant number, since it is smaller than the sum of its proper divisors (33256436088).

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

21864863112 is a wasteful number, since it uses less digits than its factorization.

21864863112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426 (or 5422 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The spelling of 21864863112 in words is "twenty-one billion, eight hundred sixty-four million, eight hundred sixty-three thousand, one hundred twelve".