1221125244 has 24 divisors (see below), whose sum is σ = 2850753360. Its totient is φ = 406833024.

The previous prime is 1221125233. The next prime is 1221125261. The reversal of 1221125244 is 4425211221.

It is a super-2 number, since 2×1221125244² = 2982293723068119072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729 + ... + 49424.

It is an arithmetic number, because the mean of its divisors is an integer number (118781390).

Almost surely, 2^1221125244 is an apocalyptic number.

It is an amenable number.

1221125244 is an abundant number, since it is smaller than the sum of its proper divisors (1629628116).

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

1221125244 is a wasteful number, since it uses less digits than its factorization.

1221125244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52189 (or 52187 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 1221125244 is about 34944.6025016740. The cubic root of 1221125244 is about 1068.8581419521.

Adding to 1221125244 its reverse (4425211221), we get a palindrome (5646336465).

The spelling of 1221125244 in words is "one billion, two hundred twenty-one million, one hundred twenty-five thousand, two hundred forty-four".