21110355311 has 2 divisors, whose sum is σ = 21110355312. Its totient is φ = 21110355310.

The previous prime is 21110355307. The next prime is 21110355367. The reversal of 21110355311 is 11355301112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21110355311 - 2² = 21110355307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110354311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555177655 + 10555177656.

It is an arithmetic number, because the mean of its divisors is an integer number (10555177656).

Almost surely, 2^21110355311 is an apocalyptic number.

21110355311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110355311 is an equidigital number, since it uses as much as digits as its factorization.

21110355311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 21110355311 its reverse (11355301112), we get a palindrome (32465656423).

The spelling of 21110355311 in words is "twenty-one billion, one hundred ten million, three hundred fifty-five thousand, three hundred eleven".