1323213220 has 48 divisors (see below), whose sum is σ = 3227793408. Its totient is φ = 446232960.

The previous prime is 1323213209. The next prime is 1323213233. The reversal of 1323213220 is 223123231.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68932 + ... + 86011.

It is an arithmetic number, because the mean of its divisors is an integer number (67245696).

Almost surely, 2^1323213220 is an apocalyptic number.

1323213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323213220 is an abundant number, since it is smaller than the sum of its proper divisors (1904580188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1323213220 is a wasteful number, since it uses less digits than its factorization.

1323213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155020 (or 155018 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1323213220 is about 36375.9978557290. The cubic root of 1323213220 is about 1097.8506846813.

Adding to 1323213220 its reverse (223123231), we get a palindrome (1546336451).

The spelling of 1323213220 in words is "one billion, three hundred twenty-three million, two hundred thirteen thousand, two hundred twenty".