21013311311 has 2 divisors, whose sum is σ = 21013311312. Its totient is φ = 21013311310.

The previous prime is 21013311259. The next prime is 21013311353. The reversal of 21013311311 is 11311331012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013311311 - 2³⁰ = 19939569487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21013311311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013311391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506655655 + 10506655656.

It is an arithmetic number, because the mean of its divisors is an integer number (10506655656).

Almost surely, 2^21013311311 is an apocalyptic number.

21013311311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013311311 is an equidigital number, since it uses as much as digits as its factorization.

21013311311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21013311311 its reverse (11311331012), we get a palindrome (32324642323).

The spelling of 21013311311 in words is "twenty-one billion, thirteen million, three hundred eleven thousand, three hundred eleven".