21315355596 has 144 divisors (see below), whose sum is σ = 56632762368. Its totient is φ = 6751382400.

The previous prime is 21315355591. The next prime is 21315355597. The reversal of 21315355596 is 69555351312.

21315355596 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 5 + 3 + 55 + 596 = 666.

It is not an unprimeable number, because it can be changed into a prime (21315355591) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29079246 + ... + 29079978.

It is an arithmetic number, because the mean of its divisors is an integer number (393283072).

Almost surely, 2^21315355596 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 21315355596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28316381184).

21315355596 is an abundant number, since it is smaller than the sum of its proper divisors (35317406772).

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

21315355596 is a wasteful number, since it uses less digits than its factorization.

21315355596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1207 counting only the distinct ones).

The product of its digits is 607500, while the sum is 45.

The spelling of 21315355596 in words is "twenty-one billion, three hundred fifteen million, three hundred fifty-five thousand, five hundred ninety-six".