121201011121 has 4 divisors (see below), whose sum is σ = 121201739632. Its totient is φ = 121200282612.

The previous prime is 121201011103. The next prime is 121201011137. The reversal of 121201011121 is 121110102121.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121201011121 - 2¹¹ = 121201009073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121201011221) 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, 21406 + ... + 492808.

It is an arithmetic number, because the mean of its divisors is an integer number (30300434908).

Almost surely, 2^121201011121 is an apocalyptic number.

It is an amenable number.

121201011121 is a deficient number, since it is larger than the sum of its proper divisors (728511).

121201011121 is an equidigital number, since it uses as much as digits as its factorization.

121201011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728510.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121201011121 its reverse (121110102121), we get a palindrome (242311113242).

The spelling of 121201011121 in words is "one hundred twenty-one billion, two hundred one million, eleven thousand, one hundred twenty-one".