121010211111 has 4 divisors (see below), whose sum is σ = 161346948152. Its totient is φ = 80673474072.

The previous prime is 121010211089. The next prime is 121010211131. The reversal of 121010211111 is 111112010121.

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

It is not a de Polignac number, because 121010211111 - 2⁹ = 121010210599 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 (121010211131) 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, 20168368516 + ... + 20168368521.

It is an arithmetic number, because the mean of its divisors is an integer number (40336737038).

Almost surely, 2^121010211111 is an apocalyptic number.

121010211111 is a deficient number, since it is larger than the sum of its proper divisors (40336737041).

121010211111 is an equidigital number, since it uses as much as digits as its factorization.

121010211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40336737040.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121010211111 its reverse (111112010121), we get a palindrome (232122221232).

The spelling of 121010211111 in words is "one hundred twenty-one billion, ten million, two hundred eleven thousand, one hundred eleven".