1321243144 has 16 divisors (see below), whose sum is σ = 2667895020. Its totient is φ = 609804480.

The previous prime is 1321243127. The next prime is 1321243151. The reversal of 1321243144 is 4413421231.

It can be written as a sum of positive squares in 2 ways, for example, as 1305955044 + 15288100 = 36138^2 + 3910^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6352027 + ... + 6352234.

Almost surely, 2^1321243144 is an apocalyptic number.

It is an amenable number.

1321243144 is an abundant number, since it is smaller than the sum of its proper divisors (1346651876).

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

1321243144 is a wasteful number, since it uses less digits than its factorization.

1321243144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12704280 (or 12704276 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 1321243144 is about 36348.9084292775. The cubic root of 1321243144 is about 1097.3055662949.

Adding to 1321243144 its reverse (4413421231), we get a palindrome (5734664375).

The spelling of 1321243144 in words is "one billion, three hundred twenty-one million, two hundred forty-three thousand, one hundred forty-four".