21311411371 has 2 divisors, whose sum is σ = 21311411372. Its totient is φ = 21311411370.

The previous prime is 21311411309. The next prime is 21311411437. The reversal of 21311411371 is 17311411312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21311411371 - 2⁷ = 21311411243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311411971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655705685 + 10655705686.

It is an arithmetic number, because the mean of its divisors is an integer number (10655705686).

Almost surely, 2^21311411371 is an apocalyptic number.

21311411371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311411371 is an equidigital number, since it uses as much as digits as its factorization.

21311411371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

Adding to 21311411371 its reverse (17311411312), we get a palindrome (38622822683).

The spelling of 21311411371 in words is "twenty-one billion, three hundred eleven million, four hundred eleven thousand, three hundred seventy-one".