21772509696 has 400 divisors, whose sum is σ = 76313704896. Its totient is φ = 6049603584.

The previous prime is 21772509679. The next prime is 21772509709. The reversal of 21772509696 is 69690527712.

21772509696 is a `hidden beast` number, since 2 + 1 + 7 + 72 + 509 + 69 + 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 39 ways as a sum of consecutive naturals, for example, 10740235 + ... + 10742261.

Almost surely, 2^21772509696 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 21772509696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38156852448).

21772509696 is an abundant number, since it is smaller than the sum of its proper divisors (54541195200).

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

21772509696 is an equidigital number, since it uses as much as digits as its factorization.

21772509696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101 (or 2076 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 21772509696 in words is "twenty-one billion, seven hundred seventy-two million, five hundred nine thousand, six hundred ninety-six".