1212211020111 has 64 divisors (see below), whose sum is σ = 2052198801408. Its totient is φ = 619335756288.

The previous prime is 1212211020073. The next prime is 1212211020121. The reversal of 1212211020111 is 1110201122121.

It is a happy number.

It is not a de Polignac number, because 1212211020111 - 2⁹ = 1212211019599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211020121) 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 63 ways as a sum of consecutive naturals, for example, 1983445 + ... + 2521601.

It is an arithmetic number, because the mean of its divisors is an integer number (32065606272).

Almost surely, 2^{1212211020111} is an apocalyptic number.

1212211020111 is a deficient number, since it is larger than the sum of its proper divisors (839987781297).

1212211020111 is a wasteful number, since it uses less digits than its factorization.

1212211020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538440.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212211020111 its reverse (1110201122121), we get a palindrome (2322412142232).

The spelling of 1212211020111 in words is "one trillion, two hundred twelve billion, two hundred eleven million, twenty thousand, one hundred eleven".