921100400 has 90 divisors (see below), whose sum is σ = 2432537016. Its totient is φ = 334928000.

The previous prime is 921100399. The next prime is 921100417. The reversal of 921100400 is 4001129.

It is a happy number.

921100400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38885 + ... + 57915.

Almost surely, 2^921100400 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 921100400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216268508).

921100400 is an abundant number, since it is smaller than the sum of its proper divisors (1511436616).

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

921100400 is a wasteful number, since it uses less digits than its factorization.

921100400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19071 (or 19049 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 921100400 is about 30349.6359121489. The cubic root of 921100400 is about 972.9764386569.

Adding to 921100400 its reverse (4001129), we get a palindrome (925101529).

The spelling of 921100400 in words is "nine hundred twenty-one million, one hundred thousand, four hundred".