21963818196 has 48 divisors (see below), whose sum is σ = 58482249280. Its totient is φ = 7123399200.

The previous prime is 21963818179. The next prime is 21963818243. The reversal of 21963818196 is 69181836912.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2744230 + ... + 2752221.

Almost surely, 2^21963818196 is an apocalyptic number.

It is an amenable number.

21963818196 is an abundant number, since it is smaller than the sum of its proper divisors (36518431084).

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

21963818196 is a wasteful number, since it uses less digits than its factorization.

21963818196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496501 (or 5496493 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The spelling of 21963818196 in words is "twenty-one billion, nine hundred sixty-three million, eight hundred eighteen thousand, one hundred ninety-six".