21168883872 has 96 divisors (see below), whose sum is σ = 61771671360. Its totient is φ = 7052970240.

The previous prime is 21168883849. The next prime is 21168883891. The reversal of 21168883872 is 27838886112.

21168883872 is a `hidden beast` number, since 21 + 168 + 88 + 387 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 2417422 + ... + 2426162.

It is an arithmetic number, because the mean of its divisors is an integer number (643454910).

Almost surely, 2^21168883872 is an apocalyptic number.

It is an amenable number.

21168883872 is an abundant number, since it is smaller than the sum of its proper divisors (40602787488).

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

21168883872 is a wasteful number, since it uses less digits than its factorization.

21168883872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11563 (or 11549 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 21168883872 in words is "twenty-one billion, one hundred sixty-eight million, eight hundred eighty-three thousand, eight hundred seventy-two".