1212122101111 has 4 divisors (see below), whose sum is σ = 1212230618424. Its totient is φ = 1212013583800.

The previous prime is 1212122100941. The next prime is 1212122101123. The reversal of 1212122101111 is 1111012212121.

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 1212122101111 - 2¹⁹ = 1212121576823 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 (1212122161111) 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, 54241900 + ... + 54264241.

It is an arithmetic number, because the mean of its divisors is an integer number (303057654606).

Almost surely, 2^{1212122101111} is an apocalyptic number.

1212122101111 is a deficient number, since it is larger than the sum of its proper divisors (108517313).

1212122101111 is a wasteful number, since it uses less digits than its factorization.

1212122101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108517312.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1212122101111 its reverse (1111012212121), we get a palindrome (2323134313232).

The spelling of 1212122101111 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred one thousand, one hundred eleven".