21001111300231 has 2 divisors, whose sum is σ = 21001111300232. Its totient is φ = 21001111300230.

The previous prime is 21001111300193. The next prime is 21001111300243. The reversal of 21001111300231 is 13200311110012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001111300231 - 2⁹ = 21001111299719 is a prime.

It is a super-2 number, since 2×21001111300231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001111300291) 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, 10500555650115 + 10500555650116.

It is an arithmetic number, because the mean of its divisors is an integer number (10500555650116).

Almost surely, 2^{21001111300231} is an apocalyptic number.

21001111300231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001111300231 is an equidigital number, since it uses as much as digits as its factorization.

21001111300231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21001111300231 its reverse (13200311110012), we get a palindrome (34201422410243).

The spelling of 21001111300231 in words is "twenty-one trillion, one billion, one hundred eleven million, three hundred thousand, two hundred thirty-one".