1211121 has 12 divisors (see below), whose sum is σ = 1797172. Its totient is φ = 785376.

The previous prime is 1211087. The next prime is 1211141.

It is a happy number.

1211121 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 505521 + 705600 = 711^2 + 840^2 .

It is not a de Polignac number, because 1211121 - 2⁶ = 1211057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1486 + ... + 2151.

2^1211121 is an apocalyptic number.

It is an amenable number.

1211121 is a deficient number, since it is larger than the sum of its proper divisors (586051).

1211121 is a wasteful number, since it uses less digits than its factorization.

1211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680 (or 3677 counting only the distinct ones).

The product of its digits is 4, while the sum is 9.

The square root of 1211121 is about 1100.5094274926. The cubic root of 1211121 is about 106.5931209605.

The spelling of 1211121 in words is "one million, two hundred eleven thousand, one hundred twenty-one".