1213121 has 8 divisors (see below), whose sum is σ = 1493184. Its totient is φ = 959760.

The previous prime is 1213109. The next prime is 1213129.

1213121 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213121 - 2⁶ = 1213057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6575 + ... + 6756.

It is an arithmetic number, because the mean of its divisors is an integer number (186648).

2^1213121 is an apocalyptic number.

It is an amenable number.

1213121 is a deficient number, since it is larger than the sum of its proper divisors (280063).

1213121 is a wasteful number, since it uses less digits than its factorization.

1213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13351.

The product of its digits is 12, while the sum is 11.

The square root of 1213121 is about 1101.4177227555. The cubic root of 1213121 is about 106.6517633258.

Multiplying 1213121 by its sum of digits (11), we get a palindrome (13344331).

The spelling of 1213121 in words is "one million, two hundred thirteen thousand, one hundred twenty-one".