111212120102021 has 2 divisors, whose sum is σ = 111212120102022. Its totient is φ = 111212120102020.

The previous prime is 111212120101997. The next prime is 111212120102059. The reversal of 111212120102021 is 120201021212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74894502613921 + 36317617488100 = 8654161^2 + 6026410^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212120102021 - 2²⁶ = 111212052993157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212120102921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606060051010 + 55606060051011.

It is an arithmetic number, because the mean of its divisors is an integer number (55606060051011).

Almost surely, 2^{111212120102021} is an apocalyptic number.

It is an amenable number.

111212120102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212120102021 is an equidigital number, since it uses as much as digits as its factorization.

111212120102021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 111212120102021 its reverse (120201021212111), we get a palindrome (231413141314132).

The spelling of 111212120102021 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty million, one hundred two thousand, twenty-one".