221135244 has 36 divisors (see below), whose sum is σ = 567157752. Its totient is φ = 67010240.

The previous prime is 221135231. The next prime is 221135249. The reversal of 221135244 is 442531122.

221135244 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221135244² = 97801592277879072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221135249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74697 + ... + 77600.

It is an arithmetic number, because the mean of its divisors is an integer number (15754382).

Almost surely, 2^221135244 is an apocalyptic number.

It is an amenable number.

221135244 is an abundant number, since it is smaller than the sum of its proper divisors (346022508).

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

221135244 is a wasteful number, since it uses less digits than its factorization.

221135244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152326 (or 152313 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 221135244 is about 14870.6167995817. The cubic root of 221135244 is about 604.7176644061.

Adding to 221135244 its reverse (442531122), we get a palindrome (663666366).

The spelling of 221135244 in words is "two hundred twenty-one million, one hundred thirty-five thousand, two hundred forty-four".