21446511768 has 96 divisors (see below), whose sum is σ = 63456728400. Its totient is φ = 6489504000.

The previous prime is 21446511703. The next prime is 21446511803. The reversal of 21446511768 is 86711564412.

21446511768 is a `hidden beast` number, since 2 + 14 + 465 + 1 + 176 + 8 = 666.

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, 535878 + ... + 574506.

Almost surely, 2^21446511768 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 21446511768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31728364200).

21446511768 is an abundant number, since it is smaller than the sum of its proper divisors (42010216632).

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

21446511768 is a wasteful number, since it uses less digits than its factorization.

21446511768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39353 (or 39346 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 21446511768 in words is "twenty-one billion, four hundred forty-six million, five hundred eleven thousand, seven hundred sixty-eight".