1323221999 has 6 divisors (see below), whose sum is σ = 1454450760. Its totient is φ = 1202928980.

The previous prime is 1323221989. The next prime is 1323222023. The reversal of 1323221999 is 9991223231.

It is a de Polignac number, because none of the positive numbers 2^k-1323221999 is a prime.

It is a super-4 number, since 4×1323221999⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323221989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5467739 + ... + 5467980.

It is an arithmetic number, because the mean of its divisors is an integer number (242408460).

Almost surely, 2^1323221999 is an apocalyptic number.

1323221999 is a deficient number, since it is larger than the sum of its proper divisors (131228761).

1323221999 is a wasteful number, since it uses less digits than its factorization.

1323221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10935741 (or 10935730 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 1323221999 is about 36376.1185257581. The cubic root of 1323221999 is about 1097.8531126119.

It can be divided in two parts, 1323 and 221999, that added together give a palindrome (223322).

The spelling of 1323221999 in words is "one billion, three hundred twenty-three million, two hundred twenty-one thousand, nine hundred ninety-nine".