21864227912 has 32 divisors (see below), whose sum is σ = 41656680000. Its totient is φ = 10756401600.

The previous prime is 21864227911. The next prime is 21864227929. The reversal of 21864227912 is 21972246812.

It is not an unprimeable number, because it can be changed into a prime (21864227911) 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, 244862 + ... + 322002.

It is an arithmetic number, because the mean of its divisors is an integer number (1301771250).

Almost surely, 2^21864227912 is an apocalyptic number.

It is an amenable number.

21864227912 is a deficient number, since it is larger than the sum of its proper divisors (19792452088).

21864227912 is a wasteful number, since it uses less digits than its factorization.

21864227912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77717 (or 77713 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The spelling of 21864227912 in words is "twenty-one billion, eight hundred sixty-four million, two hundred twenty-seven thousand, nine hundred twelve".