21273967008 has 720 divisors, whose sum is σ = 78837675840. Its totient is φ = 5590093824.

The previous prime is 21273966983. The next prime is 21273967021. The reversal of 21273967008 is 80076937212.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 127388941 + ... + 127389107.

It is an arithmetic number, because the mean of its divisors is an integer number (109496772).

Almost surely, 2^21273967008 is an apocalyptic number.

21273967008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21273967008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39418837920).

21273967008 is an abundant number, since it is smaller than the sum of its proper divisors (57563708832).

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

21273967008 is a wasteful number, since it uses less digits than its factorization.

21273967008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21273967008 in words is "twenty-one billion, two hundred seventy-three million, nine hundred sixty-seven thousand, eight".