1321213244 has 12 divisors (see below), whose sum is σ = 2489978904. Its totient is φ = 609790704.

The previous prime is 1321213237. The next prime is 1321213249. The reversal of 1321213244 is 4423121231.

It is a super-2 number, since 2×1321213244² = 3491208872242007072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321213249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12703922 + ... + 12704025.

It is an arithmetic number, because the mean of its divisors is an integer number (207498242).

Almost surely, 2^1321213244 is an apocalyptic number.

It is an amenable number.

1321213244 is a deficient number, since it is larger than the sum of its proper divisors (1168765660).

1321213244 is a wasteful number, since it uses less digits than its factorization.

1321213244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25407964 (or 25407962 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1321213244 is about 36348.4971353700. The cubic root of 1321213244 is about 1097.2972888168.

Adding to 1321213244 its reverse (4423121231), we get a palindrome (5744334475).

The spelling of 1321213244 in words is "one billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred forty-four".