1213321323 has 32 divisors (see below), whose sum is σ = 1820367360. Its totient is φ = 715080960.

The previous prime is 1213321303. The next prime is 1213321381. The reversal of 1213321323 is 3231233121.

It is not a de Polignac number, because 1213321323 - 2¹² = 1213317227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213321323.

It is not an unprimeable number, because it can be changed into a prime (1213321303) 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 31 ways as a sum of consecutive naturals, for example, 42465 + ... + 65037.

It is an arithmetic number, because the mean of its divisors is an integer number (56886480).

Almost surely, 2^1213321323 is an apocalyptic number.

1213321323 is a deficient number, since it is larger than the sum of its proper divisors (607046037).

1213321323 is a wasteful number, since it uses less digits than its factorization.

1213321323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22659.

The product of its digits is 648, while the sum is 21.

The square root of 1213321323 is about 34832.7622074391. The cubic root of 1213321323 is about 1066.5763348091.

Adding to 1213321323 its reverse (3231233121), we get a palindrome (4444554444).

The spelling of 1213321323 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, three hundred twenty-three".