21646673514 has 96 divisors (see below), whose sum is σ = 51835230720. Its totient is φ = 6498084384.

The previous prime is 21646673513. The next prime is 21646673519. The reversal of 21646673514 is 41537664612.

21646673514 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 66 + 73 + 514 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21646673514.

It is not an unprimeable number, because it can be changed into a prime (21646673513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1273717 + ... + 1290599.

It is an arithmetic number, because the mean of its divisors is an integer number (539950320).

Almost surely, 2^21646673514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21646673514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25917615360).

21646673514 is an abundant number, since it is smaller than the sum of its proper divisors (30188557206).

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

21646673514 is a wasteful number, since it uses less digits than its factorization.

21646673514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17096 (or 17093 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 21646673514 in words is "twenty-one billion, six hundred forty-six million, six hundred seventy-three thousand, five hundred fourteen".