1212121101111 has 32 divisors (see below), whose sum is σ = 1671778129920. Its totient is φ = 780382857600.

The previous prime is 1212121101091. The next prime is 1212121101127. The reversal of 1212121101111 is 1111011212121.

It is not a de Polignac number, because 1212121101111 - 2⁶ = 1212121101047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121101011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107633221 + ... + 107644481.

It is an arithmetic number, because the mean of its divisors is an integer number (52243066560).

Almost surely, 2^{1212121101111} is an apocalyptic number.

1212121101111 is a deficient number, since it is larger than the sum of its proper divisors (459657028809).

1212121101111 is a wasteful number, since it uses less digits than its factorization.

1212121101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13607.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1212121101111 its reverse (1111011212121), we get a palindrome (2323132313232).

The spelling of 1212121101111 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred one thousand, one hundred eleven".