21204341311 has 2 divisors, whose sum is σ = 21204341312. Its totient is φ = 21204341310.

The previous prime is 21204341303. The next prime is 21204341387. The reversal of 21204341311 is 11314340212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21204341311 - 2³ = 21204341303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21204348311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602170655 + 10602170656.

It is an arithmetic number, because the mean of its divisors is an integer number (10602170656).

Almost surely, 2^21204341311 is an apocalyptic number.

21204341311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204341311 is an equidigital number, since it uses as much as digits as its factorization.

21204341311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21204341311 its reverse (11314340212), we get a palindrome (32518681523).

The spelling of 21204341311 in words is "twenty-one billion, two hundred four million, three hundred forty-one thousand, three hundred eleven".