21672107124 has 12 divisors (see below), whose sum is σ = 50568249984. Its totient is φ = 7224035704.

The previous prime is 21672107081. The next prime is 21672107141. The reversal of 21672107124 is 42170127612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903004452 + ... + 903004475.

It is an arithmetic number, because the mean of its divisors is an integer number (4214020832).

Almost surely, 2^21672107124 is an apocalyptic number.

It is an amenable number.

21672107124 is an abundant number, since it is smaller than the sum of its proper divisors (28896142860).

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

21672107124 is a wasteful number, since it uses less digits than its factorization.

21672107124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806008934 (or 1806008932 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 21672107124 in words is "twenty-one billion, six hundred seventy-two million, one hundred seven thousand, one hundred twenty-four".