221451200 has 42 divisors (see below), whose sum is σ = 544912296. Its totient is φ = 88579840.

The previous prime is 221451157. The next prime is 221451211. The reversal of 221451200 is 2154122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67604 + ... + 70803.

Almost surely, 2^221451200 is an apocalyptic number.

221451200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221451200 is an abundant number, since it is smaller than the sum of its proper divisors (323461096).

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

221451200 is a wasteful number, since it uses less digits than its factorization.

221451200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138429 (or 138414 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221451200 is about 14881.2365077637. The cubic root of 221451200 is about 605.0055323584.

The spelling of 221451200 in words is "two hundred twenty-one million, four hundred fifty-one thousand, two hundred".