21420134311 has 2 divisors, whose sum is σ = 21420134312. Its totient is φ = 21420134310.

The previous prime is 21420134303. The next prime is 21420134353. The reversal of 21420134311 is 11343102412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21420134311 - 2³ = 21420134303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21420134371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710067155 + 10710067156.

It is an arithmetic number, because the mean of its divisors is an integer number (10710067156).

Almost surely, 2^21420134311 is an apocalyptic number.

21420134311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420134311 is an equidigital number, since it uses as much as digits as its factorization.

21420134311 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21420134311 its reverse (11343102412), we get a palindrome (32763236723).

The spelling of 21420134311 in words is "twenty-one billion, four hundred twenty million, one hundred thirty-four thousand, three hundred eleven".