21679873152 has 128 divisors (see below), whose sum is σ = 69685453440. Its totient is φ = 5829869568.

The previous prime is 21679873151. The next prime is 21679873207. The reversal of 21679873152 is 25137897612.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 21679873095 and 21679873104.

It is not an unprimeable number, because it can be changed into a prime (21679873151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191523 + ... + 282914.

It is an arithmetic number, because the mean of its divisors is an integer number (544417605).

Almost surely, 2^21679873152 is an apocalyptic number.

It is an amenable number.

21679873152 is an abundant number, since it is smaller than the sum of its proper divisors (48005580288).

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

21679873152 is a wasteful number, since it uses less digits than its factorization.

21679873152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474478 (or 474466 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The spelling of 21679873152 in words is "twenty-one billion, six hundred seventy-nine million, eight hundred seventy-three thousand, one hundred fifty-two".