21731183884 has 6 divisors (see below), whose sum is σ = 38029571804. Its totient is φ = 10865591940.

The previous prime is 21731183879. The next prime is 21731183891. The reversal of 21731183884 is 48838113712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716397982 + ... + 2716397989.

Almost surely, 2^21731183884 is an apocalyptic number.

It is an amenable number.

21731183884 is a deficient number, since it is larger than the sum of its proper divisors (16298387920).

21731183884 is a wasteful number, since it uses less digits than its factorization.

21731183884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432795975 (or 5432795973 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The spelling of 21731183884 in words is "twenty-one billion, seven hundred thirty-one million, one hundred eighty-three thousand, eight hundred eighty-four".