21033788616 has 32 divisors (see below), whose sum is σ = 58427191200. Its totient is φ = 7011262800.

The previous prime is 21033788609. The next prime is 21033788647. The reversal of 21033788616 is 61688733012.

21033788616 is a `hidden beast` number, since 21 + 0 + 3 + 3 + 7 + 8 + 8 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48689110 + ... + 48689541.

It is an arithmetic number, because the mean of its divisors is an integer number (1825849725).

Almost surely, 2^21033788616 is an apocalyptic number.

It is an amenable number.

21033788616 is an abundant number, since it is smaller than the sum of its proper divisors (37393402584).

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

21033788616 is a wasteful number, since it uses less digits than its factorization.

21033788616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97378666 (or 97378656 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21033788616 in words is "twenty-one billion, thirty-three million, seven hundred eighty-eight thousand, six hundred sixteen".