1321343644 has 6 divisors (see below), whose sum is σ = 2312351384. Its totient is φ = 660671820.

The previous prime is 1321343609. The next prime is 1321343669. The reversal of 1321343644 is 4463431231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165167952 + ... + 165167959.

Almost surely, 2^1321343644 is an apocalyptic number.

It is an amenable number.

1321343644 is a deficient number, since it is larger than the sum of its proper divisors (991007740).

1321343644 is a wasteful number, since it uses less digits than its factorization.

1321343644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330335915 (or 330335913 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 1321343644 is about 36350.2908379011. The cubic root of 1321343644 is about 1097.3333876726. Note that the first 4 decimals are identical.

Adding to 1321343644 its reverse (4463431231), we get a palindrome (5784774875).

The spelling of 1321343644 in words is "one billion, three hundred twenty-one million, three hundred forty-three thousand, six hundred forty-four".