1221144352 has 12 divisors (see below), whose sum is σ = 2404128006. Its totient is φ = 610572160.

The previous prime is 1221144341. The next prime is 1221144361. The reversal of 1221144352 is 2534411221.

It can be written as a sum of positive squares in only one way, i.e., 1175392656 + 45751696 = 34284^2 + 6764^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19080349 + ... + 19080412.

Almost surely, 2^1221144352 is an apocalyptic number.

It is an amenable number.

1221144352 is a deficient number, since it is larger than the sum of its proper divisors (1182983654).

1221144352 is an equidigital number, since it uses as much as digits as its factorization.

1221144352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38160771 (or 38160763 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 1221144352 is about 34944.8759047732. The cubic root of 1221144352 is about 1068.8637170382.

Adding to 1221144352 its reverse (2534411221), we get a palindrome (3755555573).

The spelling of 1221144352 in words is "one billion, two hundred twenty-one million, one hundred forty-four thousand, three hundred fifty-two".