21135333341 has 2 divisors, whose sum is σ = 21135333342. Its totient is φ = 21135333340.

The previous prime is 21135333311. The next prime is 21135333343. The reversal of 21135333341 is 14333353112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490288441 + 2645044900 = 135979^2 + 51430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21135333341 is a prime.

Together with 21135333343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21135333343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567666670 + 10567666671.

It is an arithmetic number, because the mean of its divisors is an integer number (10567666671).

Almost surely, 2^21135333341 is an apocalyptic number.

It is an amenable number.

21135333341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21135333341 is an equidigital number, since it uses as much as digits as its factorization.

21135333341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 29.

Adding to 21135333341 its reverse (14333353112), we get a palindrome (35468686453).

The spelling of 21135333341 in words is "twenty-one billion, one hundred thirty-five million, three hundred thirty-three thousand, three hundred forty-one".