21321201311 has 2 divisors, whose sum is σ = 21321201312. Its totient is φ = 21321201310.

The previous prime is 21321201299. The next prime is 21321201353. The reversal of 21321201311 is 11310212312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21321201311 - 2³⁰ = 20247459487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321201311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321201211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660600655 + 10660600656.

It is an arithmetic number, because the mean of its divisors is an integer number (10660600656).

Almost surely, 2^21321201311 is an apocalyptic number.

21321201311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321201311 is an equidigital number, since it uses as much as digits as its factorization.

21321201311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21321201311 its reverse (11310212312), we get a palindrome (32631413623).

The spelling of 21321201311 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred eleven".