111012221212021 has 2 divisors, whose sum is σ = 111012221212022. Its totient is φ = 111012221212020.

The previous prime is 111012221212019. The next prime is 111012221212111. The reversal of 111012221212021 is 120212122210111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94345496611921 + 16666724600100 = 9713161^2 + 4082490^2 .

It is an emirp because it is prime and its reverse (120212122210111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111012221212021 - 2¹ = 111012221212019 is a prime.

Together with 111012221212019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 111012221212021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012221272021) 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, 55506110606010 + 55506110606011.

It is an arithmetic number, because the mean of its divisors is an integer number (55506110606011).

Almost surely, 2^{111012221212021} is an apocalyptic number.

It is an amenable number.

111012221212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012221212021 is an equidigital number, since it uses as much as digits as its factorization.

111012221212021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111012221212021 its reverse (120212122210111), we get a palindrome (231224343422132).

The spelling of 111012221212021 in words is "one hundred eleven trillion, twelve billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".