21020102230111 has 2 divisors, whose sum is σ = 21020102230112. Its totient is φ = 21020102230110.

The previous prime is 21020102230109. The next prime is 21020102230117. The reversal of 21020102230111 is 11103220102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020102230111 - 2¹ = 21020102230109 is a prime.

Together with 21020102230109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020102230117) 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, 10510051115055 + 10510051115056.

It is an arithmetic number, because the mean of its divisors is an integer number (10510051115056).

Almost surely, 2^{21020102230111} is an apocalyptic number.

21020102230111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020102230111 is an equidigital number, since it uses as much as digits as its factorization.

21020102230111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21020102230111 its reverse (11103220102012), we get a palindrome (32123322332123).

The spelling of 21020102230111 in words is "twenty-one trillion, twenty billion, one hundred two million, two hundred thirty thousand, one hundred eleven".