121211111011 has 4 divisors (see below), whose sum is σ = 121215961224. Its totient is φ = 121206260800.

The previous prime is 121211110903. The next prime is 121211111017. The reversal of 121211111011 is 110111112121.

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

It is a cyclic number.

It is not a de Polignac number, because 121211111011 - 2¹³ = 121211102819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211110982 and 121211111000.

It is not an unprimeable number, because it can be changed into a prime (121211111017) 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, 2387425 + ... + 2437666.

It is an arithmetic number, because the mean of its divisors is an integer number (30303990306).

Almost surely, 2^121211111011 is an apocalyptic number.

121211111011 is a deficient number, since it is larger than the sum of its proper divisors (4850213).

121211111011 is an equidigital number, since it uses as much as digits as its factorization.

121211111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850212.

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

Adding to 121211111011 its reverse (110111112121), we get a palindrome (231322223132).

The spelling of 121211111011 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, eleven".