921400216 has 64 divisors (see below), whose sum is σ = 1975881600. Its totient is φ = 399033600.

The previous prime is 921400189. The next prime is 921400223. The reversal of 921400216 is 612004129.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152175 + ... + 158113.

It is an arithmetic number, because the mean of its divisors is an integer number (30873150).

Almost surely, 2^921400216 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 921400216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987940800).

921400216 is an abundant number, since it is smaller than the sum of its proper divisors (1054481384).

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

921400216 is a wasteful number, since it uses less digits than its factorization.

921400216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040 (or 6036 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 921400216 is about 30354.5748776029. The cubic root of 921400216 is about 973.0819943809.

The spelling of 921400216 in words is "nine hundred twenty-one million, four hundred thousand, two hundred sixteen".