21646740096 has 48 divisors (see below), whose sum is σ = 62290752810. Its totient is φ = 7215579648.

The previous prime is 21646740083. The next prime is 21646740107. The reversal of 21646740096 is 69004764612.

It can be written as a sum of positive squares in only one way, i.e., 12481358400 + 9165381696 = 111720^2 + 95736^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9394135 + ... + 9396438.

Almost surely, 2^21646740096 is an apocalyptic number.

It is an amenable number.

21646740096 is an abundant number, since it is smaller than the sum of its proper divisors (40644012714).

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

21646740096 is a wasteful number, since it uses less digits than its factorization.

21646740096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790593 (or 18790578 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 21646740096 in words is "twenty-one billion, six hundred forty-six million, seven hundred forty thousand, ninety-six".