121121022211121 has 4 divisors (see below), whose sum is σ = 121121045720100. Its totient is φ = 121120998702144.

The previous prime is 121121022211103. The next prime is 121121022211139. The reversal of 121121022211121 is 121112220121121.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (121121022211103) and next prime (121121022211139).

It can be written as a sum of positive squares in 2 ways, for example, as 29662880820496 + 91458141390625 = 5446364^2 + 9563375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121121022211121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121121022211093 and 121121022211102.

It is not an unprimeable number, because it can be changed into a prime (121121022211921) 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, 315956 + ... + 15567333.

It is an arithmetic number, because the mean of its divisors is an integer number (30280261430025).

Almost surely, 2^{121121022211121} is an apocalyptic number.

It is an amenable number.

121121022211121 is a deficient number, since it is larger than the sum of its proper divisors (23508979).

121121022211121 is an equidigital number, since it uses as much as digits as its factorization.

121121022211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23508978.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121121022211121 its reverse (121112220121121), we get a palindrome (242233242332242).

The spelling of 121121022211121 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-two million, two hundred eleven thousand, one hundred twenty-one".