21516263496 has 256 divisors, whose sum is σ = 75934924800. Its totient is φ = 5491411200.

The previous prime is 21516263471. The next prime is 21516263519. The reversal of 21516263496 is 69436261512.

21516263496 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 6 + 2 + 634 + 9 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 591681 + ... + 626991.

It is an arithmetic number, because the mean of its divisors is an integer number (296620800).

Almost surely, 2^21516263496 is an apocalyptic number.

21516263496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21516263496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37967462400).

21516263496 is an abundant number, since it is smaller than the sum of its proper divisors (54418661304).

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

21516263496 is a wasteful number, since it uses less digits than its factorization.

21516263496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35377 (or 35367 counting only the distinct ones).

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

The spelling of 21516263496 in words is "twenty-one billion, five hundred sixteen million, two hundred sixty-three thousand, four hundred ninety-six".