1212122011111 has 4 divisors (see below), whose sum is σ = 1322314921224. Its totient is φ = 1101929101000.

The previous prime is 1212122011063. The next prime is 1212122011117. The reversal of 1212122011111 is 1111102212121.

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 1212122011111 - 2¹³ = 1212122002919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212122011117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55096455040 + ... + 55096455061.

It is an arithmetic number, because the mean of its divisors is an integer number (330578730306).

Almost surely, 2^{1212122011111} is an apocalyptic number.

1212122011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212122011111 is a deficient number, since it is larger than the sum of its proper divisors (110192910113).

1212122011111 is a wasteful number, since it uses less digits than its factorization.

1212122011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110192910112.

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

Adding to 1212122011111 its reverse (1111102212121), we get a palindrome (2323224223232).

The spelling of 1212122011111 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, eleven thousand, one hundred eleven".