21435423311 has 2 divisors, whose sum is σ = 21435423312. Its totient is φ = 21435423310.

The previous prime is 21435423271. The next prime is 21435423329. The reversal of 21435423311 is 11332453412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435423311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21435423371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717711655 + 10717711656.

It is an arithmetic number, because the mean of its divisors is an integer number (10717711656).

Almost surely, 2^21435423311 is an apocalyptic number.

21435423311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435423311 is an equidigital number, since it uses as much as digits as its factorization.

21435423311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

Adding to 21435423311 its reverse (11332453412), we get a palindrome (32767876723).

The spelling of 21435423311 in words is "twenty-one billion, four hundred thirty-five million, four hundred twenty-three thousand, three hundred eleven".