321111121 has 4 divisors (see below), whose sum is σ = 321219892. Its totient is φ = 321002352.

The previous prime is 321111067. The next prime is 321111127. The reversal of 321111121 is 121111123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226924096 + 94187025 = 15064^2 + 9705^2 .

It is a cyclic number.

It is not a de Polignac number, because 321111121 - 2¹⁵ = 321078353 is a prime.

It is a super-2 number, since 2×321111121² = 206224704059753282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321111127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49830 + ... + 55903.

It is an arithmetic number, because the mean of its divisors is an integer number (80304973).

Almost surely, 2^321111121 is an apocalyptic number.

It is an amenable number.

321111121 is a deficient number, since it is larger than the sum of its proper divisors (108771).

321111121 is a wasteful number, since it uses less digits than its factorization.

321111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108770.

The product of its digits is 12, while the sum is 13.

The square root of 321111121 is about 17919.5736835450. The cubic root of 321111121 is about 684.7811267265.

Adding to 321111121 its reverse (121111123), we get a palindrome (442222244).

The spelling of 321111121 in words is "three hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".