21770816896 has 192 divisors, whose sum is σ = 49224996000. Its totient is φ = 9546055680.

The previous prime is 21770816869. The next prime is 21770816941. The reversal of 21770816896 is 69861807712.

It is a congruent number.

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, 60642765 + ... + 60643123.

Almost surely, 2^21770816896 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 21770816896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24612498000).

21770816896 is an abundant number, since it is smaller than the sum of its proper divisors (27454179104).

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

21770816896 is a wasteful number, since it uses less digits than its factorization.

21770816896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 21770816896 in words is "twenty-one billion, seven hundred seventy million, eight hundred sixteen thousand, eight hundred ninety-six".