21963139436 has 12 divisors (see below), whose sum is σ = 43926278928. Its totient is φ = 9412774032.

The previous prime is 21963139403. The next prime is 21963139441. The reversal of 21963139436 is 63493136912.

21963139436 is an admirable 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, 392198891 + ... + 392198946.

It is an arithmetic number, because the mean of its divisors is an integer number (3660523244).

Almost surely, 2^21963139436 is an apocalyptic number.

It is an amenable number.

21963139436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21963139436 is a wasteful number, since it uses less digits than its factorization.

21963139436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784397848 (or 784397846 counting only the distinct ones).

The product of its digits is 629856, while the sum is 47.

The spelling of 21963139436 in words is "twenty-one billion, nine hundred sixty-three million, one hundred thirty-nine thousand, four hundred thirty-six".