21023211611 has 2 divisors, whose sum is σ = 21023211612. Its totient is φ = 21023211610.

The previous prime is 21023211589. The next prime is 21023211613. The reversal of 21023211611 is 11611232012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21023211611 - 2²² = 21019017307 is a prime.

Together with 21023211613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21023211613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511605805 + 10511605806.

It is an arithmetic number, because the mean of its divisors is an integer number (10511605806).

Almost surely, 2^21023211611 is an apocalyptic number.

21023211611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023211611 is an equidigital number, since it uses as much as digits as its factorization.

21023211611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21023211611 its reverse (11611232012), we get a palindrome (32634443623).

The spelling of 21023211611 in words is "twenty-one billion, twenty-three million, two hundred eleven thousand, six hundred eleven".