21112111201 has 2 divisors, whose sum is σ = 21112111202. Its totient is φ = 21112111200.

The previous prime is 21112111151. The next prime is 21112111211. The reversal of 21112111201 is 10211121112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15018747601 + 6093363600 = 122551^2 + 78060^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112111201 - 2¹⁵ = 21112078433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112111211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556055600 + 10556055601.

It is an arithmetic number, because the mean of its divisors is an integer number (10556055601).

Almost surely, 2^21112111201 is an apocalyptic number.

It is an amenable number.

21112111201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112111201 is an equidigital number, since it uses as much as digits as its factorization.

21112111201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112111201 its reverse (10211121112), we get a palindrome (31323232313).

The spelling of 21112111201 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred one".