121111110121 has 4 divisors (see below), whose sum is σ = 122035622544. Its totient is φ = 120186597700.

The previous prime is 121111110101. The next prime is 121111110137. The reversal of 121111110121 is 121011111121.

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 121111110121 - 2³¹ = 118963626473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111110101) 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, 462256015 + ... + 462256276.

It is an arithmetic number, because the mean of its divisors is an integer number (30508905636).

Almost surely, 2^121111110121 is an apocalyptic number.

It is an amenable number.

121111110121 is a deficient number, since it is larger than the sum of its proper divisors (924512423).

121111110121 is an equidigital number, since it uses as much as digits as its factorization.

121111110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924512422.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121111110121 its reverse (121011111121), we get a palindrome (242122221242).

The spelling of 121111110121 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-one".