21670373992 has 16 divisors (see below), whose sum is σ = 40635490500. Its totient is φ = 10834243200.

The previous prime is 21670373953. The next prime is 21670373999. The reversal of 21670373992 is 29937307612.

It can be written as a sum of positive squares in 2 ways, for example, as 21563747716 + 106626276 = 146846^2 + 10326^2 .

It is not an unprimeable number, because it can be changed into a prime (21670373999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15117 + ... + 208732.

Almost surely, 2^21670373992 is an apocalyptic number.

It is an amenable number.

21670373992 is a deficient number, since it is larger than the sum of its proper divisors (18965116508).

21670373992 is a wasteful number, since it uses less digits than its factorization.

21670373992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235956 (or 235952 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 49.

The spelling of 21670373992 in words is "twenty-one billion, six hundred seventy million, three hundred seventy-three thousand, nine hundred ninety-two".