121111002121 has 4 divisors (see below), whose sum is σ = 124064929044. Its totient is φ = 118157075200.

The previous prime is 121111002113. The next prime is 121111002139. The reversal of 121111002121 is 121200111121.

It is a happy number.

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 3692385225 + 117418616896 = 60765^2 + 342664^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111002121 - 2³ = 121111002113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111002191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476963400 + ... + 1476963481.

It is an arithmetic number, because the mean of its divisors is an integer number (31016232261).

Almost surely, 2^121111002121 is an apocalyptic number.

It is an amenable number.

121111002121 is a deficient number, since it is larger than the sum of its proper divisors (2953926923).

121111002121 is an equidigital number, since it uses as much as digits as its factorization.

121111002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953926922.

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

Adding to 121111002121 its reverse (121200111121), we get a palindrome (242311113242).

The spelling of 121111002121 in words is "one hundred twenty-one billion, one hundred eleven million, two thousand, one hundred twenty-one".