21021010201111 has 2 divisors, whose sum is σ = 21021010201112. Its totient is φ = 21021010201110.

The previous prime is 21021010201097. The next prime is 21021010201133. The reversal of 21021010201111 is 11110201012012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021010201111 - 2³⁹ = 20471254387223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021010201091 and 21021010201100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021010201151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510505100555 + 10510505100556.

It is an arithmetic number, because the mean of its divisors is an integer number (10510505100556).

Almost surely, 2^{21021010201111} is an apocalyptic number.

21021010201111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021010201111 is an equidigital number, since it uses as much as digits as its factorization.

21021010201111 is an evil number, because the sum of its binary digits is even.

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

Adding to 21021010201111 its reverse (11110201012012), we get a palindrome (32131211213123).

The spelling of 21021010201111 in words is "twenty-one trillion, twenty-one billion, ten million, two hundred one thousand, one hundred eleven".