21213780176 has 20 divisors (see below), whose sum is σ = 41153949312. Its totient is φ = 10593406176.

The previous prime is 21213780151. The next prime is 21213780197. The reversal of 21213780176 is 67108731212.

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, 829760 + ... + 854943.

Almost surely, 2^21213780176 is an apocalyptic number.

It is an amenable number.

21213780176 is a deficient number, since it is larger than the sum of its proper divisors (19940169136).

21213780176 is a wasteful number, since it uses less digits than its factorization.

21213780176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685498 (or 1685492 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 21213780176 in words is "twenty-one billion, two hundred thirteen million, seven hundred eighty thousand, one hundred seventy-six".