21336311371 has 2 divisors, whose sum is σ = 21336311372. Its totient is φ = 21336311370.

The previous prime is 21336311327. The next prime is 21336311401. The reversal of 21336311371 is 17311363312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21336311371 - 2¹³ = 21336303179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336381371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668155685 + 10668155686.

It is an arithmetic number, because the mean of its divisors is an integer number (10668155686).

Almost surely, 2^21336311371 is an apocalyptic number.

21336311371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336311371 is an equidigital number, since it uses as much as digits as its factorization.

21336311371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

Adding to 21336311371 its reverse (17311363312), we get a palindrome (38647674683).

The spelling of 21336311371 in words is "twenty-one billion, three hundred thirty-six million, three hundred eleven thousand, three hundred seventy-one".