121002120111 has 4 divisors (see below), whose sum is σ = 161336160152. Its totient is φ = 80668080072.

The previous prime is 121002120077. The next prime is 121002120121. The reversal of 121002120111 is 111021200121.

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

It is not a de Polignac number, because 121002120111 - 2⁹ = 121002119599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002120121) 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, 20167020016 + ... + 20167020021.

It is an arithmetic number, because the mean of its divisors is an integer number (40334040038).

Almost surely, 2^121002120111 is an apocalyptic number.

121002120111 is a deficient number, since it is larger than the sum of its proper divisors (40334040041).

121002120111 is an equidigital number, since it uses as much as digits as its factorization.

121002120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40334040040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121002120111 its reverse (111021200121), we get a palindrome (232023320232).

The spelling of 121002120111 in words is "one hundred twenty-one billion, two million, one hundred twenty thousand, one hundred eleven".