121121122222211 has 4 divisors (see below), whose sum is σ = 121154701688592. Its totient is φ = 121087542755832.

The previous prime is 121121122222181. The next prime is 121121122222213. The reversal of 121121122222211 is 112222221121121.

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

It is a cyclic number.

It is not a de Polignac number, because 121121122222211 - 2¹⁸ = 121121121960067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121122222213) 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, 16789727780 + ... + 16789734993.

It is an arithmetic number, because the mean of its divisors is an integer number (30288675422148).

Almost surely, 2^{121121122222211} is an apocalyptic number.

121121122222211 is a deficient number, since it is larger than the sum of its proper divisors (33579466381).

121121122222211 is an equidigital number, since it uses as much as digits as its factorization.

121121122222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33579466380.

The product of its digits is 256, while the sum is 23.

Adding to 121121122222211 its reverse (112222221121121), we get a palindrome (233343343343332).

The spelling of 121121122222211 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".