21199138124 has 24 divisors (see below), whose sum is σ = 37949237760. Its totient is φ = 10357230096.

The previous prime is 21199138117. The next prime is 21199138141. The reversal of 21199138124 is 42183199112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25289 + ... + 207455.

It is an arithmetic number, because the mean of its divisors is an integer number (1581218240).

Almost surely, 2^21199138124 is an apocalyptic number.

It is an amenable number.

21199138124 is a deficient number, since it is larger than the sum of its proper divisors (16750099636).

21199138124 is a wasteful number, since it uses less digits than its factorization.

21199138124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182837 (or 182835 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The spelling of 21199138124 in words is "twenty-one billion, one hundred ninety-nine million, one hundred thirty-eight thousand, one hundred twenty-four".