121216841 has 4 divisors (see below), whose sum is σ = 121438992. Its totient is φ = 120994692.

The previous prime is 121216811. The next prime is 121216853. The reversal of 121216841 is 148612121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 148612121 = 7 ⋅21230303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121216841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121216841.

It is not an unprimeable number, because it can be changed into a prime (121216811) 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, 110255 + ... + 111348.

It is an arithmetic number, because the mean of its divisors is an integer number (30359748).

Almost surely, 2^121216841 is an apocalyptic number.

It is an amenable number.

121216841 is a deficient number, since it is larger than the sum of its proper divisors (222151).

121216841 is an equidigital number, since it uses as much as digits as its factorization.

121216841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222150.

The product of its digits is 768, while the sum is 26.

The square root of 121216841 is about 11009.8519971887. The cubic root of 121216841 is about 494.9040265588.

Adding to 121216841 its reverse (148612121), we get a palindrome (269828962).

The spelling of 121216841 in words is "one hundred twenty-one million, two hundred sixteen thousand, eight hundred forty-one".