21010111201 has 2 divisors, whose sum is σ = 21010111202. Its totient is φ = 21010111200.

The previous prime is 21010111163. The next prime is 21010111207. The reversal of 21010111201 is 10211101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13928720400 + 7081390801 = 118020^2 + 84151^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010111201 - 2¹⁷ = 21009980129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010111207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505055600 + 10505055601.

It is an arithmetic number, because the mean of its divisors is an integer number (10505055601).

Almost surely, 2^21010111201 is an apocalyptic number.

It is an amenable number.

21010111201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010111201 is an equidigital number, since it uses as much as digits as its factorization.

21010111201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21010111201 its reverse (10211101012), we get a palindrome (31221212213).

The spelling of 21010111201 in words is "twenty-one billion, ten million, one hundred eleven thousand, two hundred one".