21111301 has 2 divisors, whose sum is σ = 21111302. Its totient is φ = 21111300.

The previous prime is 21111287. The next prime is 21111373. The reversal of 21111301 is 10311112.

21111301 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 454276 = 4545^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111301 - 2⁷ = 21111173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21181301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555650 + 10555651.

It is an arithmetic number, because the mean of its divisors is an integer number (10555651).

Almost surely, 2^21111301 is an apocalyptic number.

It is an amenable number.

21111301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111301 is an equidigital number, since it uses as much as digits as its factorization.

21111301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 21111301 is about 4594.7035812988. The cubic root of 21111301 is about 276.3789733754.

Adding to 21111301 its reverse (10311112), we get a palindrome (31422413).

It can be divided in two parts, 21111 and 301, that added together give a palindrome (21412).

The spelling of 21111301 in words is "twenty-one million, one hundred eleven thousand, three hundred one".