21915847296 has 768 divisors, whose sum is σ = 82121195520. Its totient is φ = 5673369600.

The previous prime is 21915847273. The next prime is 21915847337. The reversal of 21915847296 is 69274851912.

It is a happy number.

21915847296 is a `hidden beast` number, since 2 + 19 + 158 + 472 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 114742561 + ... + 114742751.

It is an arithmetic number, because the mean of its divisors is an integer number (106928640).

Almost surely, 2^21915847296 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 21915847296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41060597760).

21915847296 is an abundant number, since it is smaller than the sum of its proper divisors (60205348224).

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

21915847296 is a wasteful number, since it uses less digits than its factorization.

21915847296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 251 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 21915847296 in words is "twenty-one billion, nine hundred fifteen million, eight hundred forty-seven thousand, two hundred ninety-six".