121121220111121 has 4 divisors (see below), whose sum is σ = 121124274217200. Its totient is φ = 121118166005044.

The previous prime is 121121220111109. The next prime is 121121220111131. The reversal of 121121220111121 is 121111022121121.

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 121121220111121 - 2²¹ = 121121218013969 is a prime.

It is a super-2 number, since 2×121121220111121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121220111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526993551 + ... + 1527072868.

It is an arithmetic number, because the mean of its divisors is an integer number (30281068554300).

Almost surely, 2^{121121220111121} is an apocalyptic number.

It is an amenable number.

121121220111121 is a deficient number, since it is larger than the sum of its proper divisors (3054106079).

121121220111121 is an equidigital number, since it uses as much as digits as its factorization.

121121220111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054106078.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121121220111121 its reverse (121111022121121), we get a palindrome (242232242232242).

The spelling of 121121220111121 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".