1212211100111 has 4 divisors (see below), whose sum is σ = 1322412109224. Its totient is φ = 1102010091000.

The previous prime is 1212211100081. The next prime is 1212211100197. The reversal of 1212211100111 is 1110011122121.

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 1212211100111 - 2³⁴ = 1195031230927 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 (1212211100911) 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, 55100504540 + ... + 55100504561.

It is an arithmetic number, because the mean of its divisors is an integer number (330603027306).

Almost surely, 2^{1212211100111} is an apocalyptic number.

1212211100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212211100111 is a deficient number, since it is larger than the sum of its proper divisors (110201009113).

1212211100111 is a wasteful number, since it uses less digits than its factorization.

1212211100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110201009112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1212211100111 its reverse (1110011122121), we get a palindrome (2322222222232).

The spelling of 1212211100111 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred thousand, one hundred eleven".