21043401311 has 2 divisors, whose sum is σ = 21043401312. Its totient is φ = 21043401310.

The previous prime is 21043401289. The next prime is 21043401343. The reversal of 21043401311 is 11310434012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21043401311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043401011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521700655 + 10521700656.

It is an arithmetic number, because the mean of its divisors is an integer number (10521700656).

Almost surely, 2^21043401311 is an apocalyptic number.

21043401311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043401311 is an equidigital number, since it uses as much as digits as its factorization.

21043401311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21043401311 its reverse (11310434012), we get a palindrome (32353835323).

The spelling of 21043401311 in words is "twenty-one billion, forty-three million, four hundred one thousand, three hundred eleven".