1321213522 has 32 divisors (see below), whose sum is σ = 2055144960. Its totient is φ = 636676800.

The previous prime is 1321213513. The next prime is 1321213547. The reversal of 1321213522 is 2253121231.

It is a junction number, because it is equal to n+sod(n) for n = 1321213493 and 1321213502.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3009379 + ... + 3009817.

It is an arithmetic number, because the mean of its divisors is an integer number (64223280).

Almost surely, 2^1321213522 is an apocalyptic number.

1321213522 is a deficient number, since it is larger than the sum of its proper divisors (733931438).

1321213522 is a wasteful number, since it uses less digits than its factorization.

1321213522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 720, while the sum is 22.

The square root of 1321213522 is about 36348.5009594619. The cubic root of 1321213522 is about 1097.2973657785.

Adding to 1321213522 its reverse (2253121231), we get a palindrome (3574334753).

The spelling of 1321213522 in words is "one billion, three hundred twenty-one million, two hundred thirteen thousand, five hundred twenty-two".