21333495816 has 96 divisors (see below), whose sum is σ = 59391446400. Its totient is φ = 6912950400.

The previous prime is 21333495791. The next prime is 21333495917. The reversal of 21333495816 is 61859433312.

21333495816 is a `hidden beast` number, since 2 + 1 + 33 + 34 + 9 + 581 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3862705 + ... + 3868223.

It is an arithmetic number, because the mean of its divisors is an integer number (618660900).

Almost surely, 2^21333495816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21333495816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29695723200).

21333495816 is an abundant number, since it is smaller than the sum of its proper divisors (38057950584).

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

21333495816 is a wasteful number, since it uses less digits than its factorization.

21333495816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7019 (or 7012 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 21333495816 in words is "twenty-one billion, three hundred thirty-three million, four hundred ninety-five thousand, eight hundred sixteen".