121111001211121 has 4 divisors (see below), whose sum is σ = 121376014343332. Its totient is φ = 120845988078912.

The previous prime is 121111001211077. The next prime is 121111001211131. The reversal of 121111001211121 is 121112100111121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42888562732096 + 78222438479025 = 6548936^2 + 8844345^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111001211121 - 2⁷ = 121111001210993 is a prime.

It is a super-2 number, since 2×121111001211121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111001211095 and 121111001211104.

It is not an unprimeable number, because it can be changed into a prime (121111001211131) 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, 132506565420 + ... + 132506566333.

It is an arithmetic number, because the mean of its divisors is an integer number (30344003585833).

Almost surely, 2^{121111001211121} is an apocalyptic number.

It is an amenable number.

121111001211121 is a deficient number, since it is larger than the sum of its proper divisors (265013132211).

121111001211121 is an equidigital number, since it uses as much as digits as its factorization.

121111001211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265013132210.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 121111001211121 its reverse (121112100111121), we get a palindrome (242223101322242).

The spelling of 121111001211121 in words is "one hundred twenty-one trillion, one hundred eleven billion, one million, two hundred eleven thousand, one hundred twenty-one".