21013101211 has 2 divisors, whose sum is σ = 21013101212. Its totient is φ = 21013101210.

The previous prime is 21013101157. The next prime is 21013101223. The reversal of 21013101211 is 11210131012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013101211 - 2¹³ = 21013093019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21013101191 and 21013101200.

It is not a weakly prime, because it can be changed into another prime (21013101911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506550605 + 10506550606.

It is an arithmetic number, because the mean of its divisors is an integer number (10506550606).

Almost surely, 2^21013101211 is an apocalyptic number.

21013101211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013101211 is an equidigital number, since it uses as much as digits as its factorization.

21013101211 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 21013101211 its reverse (11210131012), we get a palindrome (32223232223).

It can be divided in two parts, 210131012 and 11, that multiplied together give a palindrome (2311441132).

The spelling of 21013101211 in words is "twenty-one billion, thirteen million, one hundred one thousand, two hundred eleven".