1323725221 has 16 divisors (see below), whose sum is σ = 1668941568. Its totient is φ = 1021795200.

The previous prime is 1323725197. The next prime is 1323725261. The reversal of 1323725221 is 1225273231.

It is a cyclic number.

It is not a de Polignac number, because 1323725221 - 2⁵ = 1323725189 is a prime.

It is a super-2 number, since 2×1323725221² = 3504496921422997682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1323725221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323725261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173665 + ... + 181126.

It is an arithmetic number, because the mean of its divisors is an integer number (104308848).

Almost surely, 2^1323725221 is an apocalyptic number.

It is an amenable number.

1323725221 is a deficient number, since it is larger than the sum of its proper divisors (345216347).

1323725221 is a wasteful number, since it uses less digits than its factorization.

1323725221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354852.

The product of its digits is 5040, while the sum is 28.

The square root of 1323725221 is about 36383.0347964542. The cubic root of 1323725221 is about 1097.9922663392.

Adding to 1323725221 its reverse (1225273231), we get a palindrome (2548998452).

The spelling of 1323725221 in words is "one billion, three hundred twenty-three million, seven hundred twenty-five thousand, two hundred twenty-one".