21033788612 has 6 divisors (see below), whose sum is σ = 36809130078. Its totient is φ = 10516894304.

The previous prime is 21033788609. The next prime is 21033788647. The reversal of 21033788612 is 21688733012.

It can be written as a sum of positive squares in only one way, i.e., 20556103876 + 477684736 = 143374^2 + 21856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21033788612.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629223573 + ... + 2629223580.

It is an arithmetic number, because the mean of its divisors is an integer number (6134855013).

Almost surely, 2^21033788612 is an apocalyptic number.

It is an amenable number.

21033788612 is a deficient number, since it is larger than the sum of its proper divisors (15775341466).

21033788612 is a wasteful number, since it uses less digits than its factorization.

21033788612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258447157 (or 5258447155 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21033788612 in words is "twenty-one billion, thirty-three million, seven hundred eighty-eight thousand, six hundred twelve".