1321213408 has 24 divisors (see below), whose sum is σ = 2605380120. Its totient is φ = 659529600.

The previous prime is 1321213391. The next prime is 1321213409. The reversal of 1321213408 is 8043121231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321213409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13543 + ... + 53158.

It is an arithmetic number, because the mean of its divisors is an integer number (108557505).

Almost surely, 2^1321213408 is an apocalyptic number.

It is an amenable number.

1321213408 is a deficient number, since it is larger than the sum of its proper divisors (1284166712).

1321213408 is an equidigital number, since it uses as much as digits as its factorization.

1321213408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67330 (or 67322 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1321213408 is about 36348.4993913091. The cubic root of 1321213408 is about 1097.2973342186.

Adding to 1321213408 its reverse (8043121231), we get a palindrome (9364334639).

The spelling of 1321213408 in words is "one billion, three hundred twenty-one million, two hundred thirteen thousand, four hundred eight".