21697481415168 has 560 divisors, whose sum is σ = 72257612883456. Its totient is φ = 6460743720960.

The previous prime is 21697481415151. The next prime is 21697481415191. The reversal of 21697481415168 is 86151418479612.

21697481415168 is a `hidden beast` number, since 2 + 1 + 6 + 9 + 7 + 481 + 41 + 51 + 68 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 150346821 + ... + 150491067.

Almost surely, 2^{21697481415168} 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 21697481415168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36128806441728).

21697481415168 is an abundant number, since it is smaller than the sum of its proper divisors (50560131468288).

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

21697481415168 is an equidigital number, since it uses as much as digits as its factorization.

21697481415168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144327 (or 144296 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 21697481415168 in words is "twenty-one trillion, six hundred ninety-seven billion, four hundred eighty-one million, four hundred fifteen thousand, one hundred sixty-eight".