1212221012111 has 4 divisors (see below), whose sum is σ = 1212328423152. Its totient is φ = 1212113601072.

The previous prime is 1212221012083. The next prime is 1212221012117. The reversal of 1212221012111 is 1112101222121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212221012111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212221012111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221012117) 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, 53688590 + ... + 53711163.

It is an arithmetic number, because the mean of its divisors is an integer number (303082105788).

Almost surely, 2^{1212221012111} is an apocalyptic number.

1212221012111 is a deficient number, since it is larger than the sum of its proper divisors (107411041).

1212221012111 is a wasteful number, since it uses less digits than its factorization.

1212221012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107411040.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212221012111 its reverse (1112101222121), we get a palindrome (2324322234232).

The spelling of 1212221012111 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twelve thousand, one hundred eleven".