21450673368 has 256 divisors, whose sum is σ = 63432576000. Its totient is φ = 6789847680.

The previous prime is 21450673331. The next prime is 21450673441. The reversal of 21450673368 is 86337605412.

21450673368 is a `hidden beast` number, since 2 + 14 + 506 + 73 + 3 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33994413 + ... + 33995043.

It is an arithmetic number, because the mean of its divisors is an integer number (247783500).

Almost surely, 2^21450673368 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 21450673368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31716288000).

21450673368 is an abundant number, since it is smaller than the sum of its proper divisors (41981902632).

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

21450673368 is an equidigital number, since it uses as much as digits as its factorization.

21450673368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 732 counting only the distinct ones).

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

The spelling of 21450673368 in words is "twenty-one billion, four hundred fifty million, six hundred seventy-three thousand, three hundred sixty-eight".