21466949616 has 80 divisors (see below), whose sum is σ = 70420691200. Its totient is φ = 6133413312.

The previous prime is 21466949557. The next prime is 21466949633. The reversal of 21466949616 is 61694966412.

21466949616 is a `hidden beast` number, since 2 + 1 + 466 + 94 + 96 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3546406 + ... + 3552453.

It is an arithmetic number, because the mean of its divisors is an integer number (880258640).

Almost surely, 2^21466949616 is an apocalyptic number.

It is an amenable number.

21466949616 is an abundant number, since it is smaller than the sum of its proper divisors (48953741584).

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

21466949616 is a wasteful number, since it uses less digits than its factorization.

21466949616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7098883 (or 7098871 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The spelling of 21466949616 in words is "twenty-one billion, four hundred sixty-six million, nine hundred forty-nine thousand, six hundred sixteen".