21001110210211 has 2 divisors, whose sum is σ = 21001110210212. Its totient is φ = 21001110210210.

The previous prime is 21001110210203. The next prime is 21001110210217. The reversal of 21001110210211 is 11201201110012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001110210211 - 2³ = 21001110210203 is a prime.

It is a super-2 number, since 2×21001110210211² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001110210191 and 21001110210200.

It is not a weakly prime, because it can be changed into another prime (21001110210217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500555105105 + 10500555105106.

It is an arithmetic number, because the mean of its divisors is an integer number (10500555105106).

Almost surely, 2^{21001110210211} is an apocalyptic number.

21001110210211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001110210211 is an equidigital number, since it uses as much as digits as its factorization.

21001110210211 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 21001110210211 its reverse (11201201110012), we get a palindrome (32202311320223).

The spelling of 21001110210211 in words is "twenty-one trillion, one billion, one hundred ten million, two hundred ten thousand, two hundred eleven".