221244372 has 60 divisors (see below), whose sum is σ = 580405056. Its totient is φ = 73489680.

The previous prime is 221244347. The next prime is 221244421. The reversal of 221244372 is 273442122.

221244372 is a `hidden beast` number, since 2 + 212 + 443 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 106213 + ... + 108275.

Almost surely, 2^221244372 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 221244372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290202528).

221244372 is an abundant number, since it is smaller than the sum of its proper divisors (359160684).

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

221244372 is a wasteful number, since it uses less digits than its factorization.

221244372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410 (or 2399 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 221244372 is about 14874.2855962900. The cubic root of 221244372 is about 604.8171220587.

Adding to 221244372 its reverse (273442122), we get a palindrome (494686494).

The spelling of 221244372 in words is "two hundred twenty-one million, two hundred forty-four thousand, three hundred seventy-two".