121212021020111 has 32 divisors (see below), whose sum is σ = 139317131174400. Its totient is φ = 103305461074560.

The previous prime is 121212021020021. The next prime is 121212021020159. The reversal of 121212021020111 is 111020120212121.

It is a cyclic number.

It is not a de Polignac number, because 121212021020111 - 2¹⁰ = 121212021019087 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 121212021020111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212021020161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5506372541 + ... + 5506394553.

It is an arithmetic number, because the mean of its divisors is an integer number (4353660349200).

Almost surely, 2^{121212021020111} is an apocalyptic number.

121212021020111 is a deficient number, since it is larger than the sum of its proper divisors (18105110154289).

121212021020111 is a wasteful number, since it uses less digits than its factorization.

121212021020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26639.

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

Adding to 121212021020111 its reverse (111020120212121), we get a palindrome (232232141232232).

The spelling of 121212021020111 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty-one million, twenty thousand, one hundred eleven".