921381940224 has 132 divisors (see below), whose sum is σ = 2671894911816. Its totient is φ = 305808457728.

The previous prime is 921381940123. The next prime is 921381940229. The reversal of 921381940224 is 422049183129.

921381940224 is a `hidden beast` number, since 9 + 2 + 1 + 381 + 9 + 40 + 224 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 921381940224.

It is not an unprimeable number, because it can be changed into a prime (921381940229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1932787 + ... + 2361869.

Almost surely, 2^921381940224 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 921381940224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335947455908).

921381940224 is an abundant number, since it is smaller than the sum of its proper divisors (1750512971592).

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

921381940224 is a wasteful number, since it uses less digits than its factorization.

921381940224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429342 (or 429321 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 921381940224 in words is "nine hundred twenty-one billion, three hundred eighty-one million, nine hundred forty thousand, two hundred twenty-four".