21355331411 has 2 divisors, whose sum is σ = 21355331412. Its totient is φ = 21355331410.

The previous prime is 21355331357. The next prime is 21355331423. The reversal of 21355331411 is 11413355312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21355331411 - 2³⁴ = 4175462227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21355331441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677665705 + 10677665706.

It is an arithmetic number, because the mean of its divisors is an integer number (10677665706).

Almost surely, 2^21355331411 is an apocalyptic number.

21355331411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355331411 is an equidigital number, since it uses as much as digits as its factorization.

21355331411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

Adding to 21355331411 its reverse (11413355312), we get a palindrome (32768686723).

The spelling of 21355331411 in words is "twenty-one billion, three hundred fifty-five million, three hundred thirty-one thousand, four hundred eleven".