21010113211 has 2 divisors, whose sum is σ = 21010113212. Its totient is φ = 21010113210.

The previous prime is 21010113077. The next prime is 21010113247. The reversal of 21010113211 is 11231101012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010113211 - 2¹¹ = 21010111163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010113191 and 21010113200.

It is not a weakly prime, because it can be changed into another prime (21010113251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505056605 + 10505056606.

It is an arithmetic number, because the mean of its divisors is an integer number (10505056606).

Almost surely, 2^21010113211 is an apocalyptic number.

21010113211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010113211 is an equidigital number, since it uses as much as digits as its factorization.

21010113211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21010113211 its reverse (11231101012), we get a palindrome (32241214223).

The spelling of 21010113211 in words is "twenty-one billion, ten million, one hundred thirteen thousand, two hundred eleven".