121111211211121 has 8 divisors (see below), whose sum is σ = 121775498505288. Its totient is φ = 120448578432000.

The previous prime is 121111211211103. The next prime is 121111211211127. The reversal of 121111211211121 is 121112112111121.

It can be written as a sum of positive squares in 4 ways, for example, as 24851860106896 + 96259351104225 = 4985164^2 + 9811185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121111211211121 - 2⁷ = 121111211210993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111211211127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413481960 + ... + 413774761.

It is an arithmetic number, because the mean of its divisors is an integer number (15221937313161).

Almost surely, 2^{121111211211121} is an apocalyptic number.

It is an amenable number.

121111211211121 is a deficient number, since it is larger than the sum of its proper divisors (664287294167).

121111211211121 is an equidigital number, since it uses as much as digits as its factorization.

121111211211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827257523.

The product of its digits is 16, while the sum is 19.

Adding to 121111211211121 its reverse (121112112111121), we get a palindrome (242223323322242).

The spelling of 121111211211121 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".