1216121 has 4 divisors (see below), whose sum is σ = 1228032. Its totient is φ = 1204212.

The previous prime is 1216109. The next prime is 1216123.

1216121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216121 - 2¹⁸ = 953977 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216096 and 1216105.

It is not an unprimeable number, because it can be changed into a prime (1216123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 6006.

It is an arithmetic number, because the mean of its divisors is an integer number (307008).

2^1216121 is an apocalyptic number.

It is an amenable number.

1216121 is a deficient number, since it is larger than the sum of its proper divisors (11911).

1216121 is a wasteful number, since it uses less digits than its factorization.

1216121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11910.

The product of its digits is 24, while the sum is 14.

The square root of 1216121 is about 1102.7787629439. The cubic root of 1216121 is about 106.7396061450.

The spelling of 1216121 in words is "one million, two hundred sixteen thousand, one hundred twenty-one".