921228422400 has 3240 divisors, whose sum is σ = 4349790074784. Its totient is φ = 189510451200.

The previous prime is 921228422393. The next prime is 921228422423. The reversal of 921228422400 is 4224822129.

921228422400 is a `hidden beast` number, since 9 + 2 + 1 + 228 + 4 + 22 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (3240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 21423916779 + ... + 21423916821.

Almost surely, 2^921228422400 is an apocalyptic number.

921228422400 is a gapful number since it is divisible by the number (90) 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 921228422400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174895037392).

921228422400 is an abundant number, since it is smaller than the sum of its proper divisors (3428561652384).

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

921228422400 is a wasteful number, since it uses less digits than its factorization.

921228422400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 921228422400 in words is "nine hundred twenty-one billion, two hundred twenty-eight million, four hundred twenty-two thousand, four hundred".