1211323321 has 32 divisors (see below), whose sum is σ = 1481639040. Its totient is φ = 977992704.

The previous prime is 1211323307. The next prime is 1211323327. The reversal of 1211323321 is 1233231121.

It is not a de Polignac number, because 1211323321 - 2⁷ = 1211323193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211323327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219826 + ... + 225268.

It is an arithmetic number, because the mean of its divisors is an integer number (46301220).

Almost surely, 2^1211323321 is an apocalyptic number.

It is an amenable number.

1211323321 is a deficient number, since it is larger than the sum of its proper divisors (270315719).

1211323321 is a wasteful number, since it uses less digits than its factorization.

1211323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545.

The product of its digits is 216, while the sum is 19.

The square root of 1211323321 is about 34804.0704659671. The cubic root of 1211323321 is about 1065.9905618530.

Adding to 1211323321 its reverse (1233231121), we get a palindrome (2444554442).

The spelling of 1211323321 in words is "one billion, two hundred eleven million, three hundred twenty-three thousand, three hundred twenty-one".