111022212210821 has 2 divisors, whose sum is σ = 111022212210822. Its totient is φ = 111022212210820.

The previous prime is 111022212210803. The next prime is 111022212210857. The reversal of 111022212210821 is 128012212220111.

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., 109478868136225 + 1543344074596 = 10463215^2 + 1242314^2 .

It is a cyclic number.

It is not a de Polignac number, because 111022212210821 - 2³⁸ = 110747334303877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111022212210121) 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, 55511106105410 + 55511106105411.

It is an arithmetic number, because the mean of its divisors is an integer number (55511106105411).

Almost surely, 2^{111022212210821} is an apocalyptic number.

It is an amenable number.

111022212210821 is a deficient number, since it is larger than the sum of its proper divisors (1).

111022212210821 is an equidigital number, since it uses as much as digits as its factorization.

111022212210821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 111022212210821 its reverse (128012212220111), we get a palindrome (239034424430932).

The spelling of 111022212210821 in words is "one hundred eleven trillion, twenty-two billion, two hundred twelve million, two hundred ten thousand, eight hundred twenty-one".