21358785616 has 40 divisors (see below), whose sum is σ = 48259659200. Its totient is φ = 9153762912.

The previous prime is 21358785611. The next prime is 21358785667. The reversal of 21358785616 is 61658785312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21358785611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940466 + ... + 1951441.

It is an arithmetic number, because the mean of its divisors is an integer number (1206491480).

Almost surely, 2^21358785616 is an apocalyptic number.

It is an amenable number.

21358785616 is an abundant number, since it is smaller than the sum of its proper divisors (26900873584).

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

21358785616 is an equidigital number, since it uses as much as digits as its factorization.

21358785616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891936 (or 3891916 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 52.

The spelling of 21358785616 in words is "twenty-one billion, three hundred fifty-eight million, seven hundred eighty-five thousand, six hundred sixteen".