921231180672 has 384 divisors, whose sum is σ = 2761277904000. Its totient is φ = 271823523840.

The previous prime is 921231180643. The next prime is 921231180677. The reversal of 921231180672 is 276081132129.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921231180677) 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, 298808443 + ... + 298811525.

It is an arithmetic number, because the mean of its divisors is an integer number (7190827875).

Almost surely, 2^921231180672 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 921231180672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380638952000).

921231180672 is an abundant number, since it is smaller than the sum of its proper divisors (1840046723328).

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

921231180672 is a wasteful number, since it uses less digits than its factorization.

921231180672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 921231180672 in words is "nine hundred twenty-one billion, two hundred thirty-one million, one hundred eighty thousand, six hundred seventy-two".