21423564011 has 2 divisors, whose sum is σ = 21423564012. Its totient is φ = 21423564010.

The previous prime is 21423563989. The next prime is 21423564013. The reversal of 21423564011 is 11046532412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423564011 - 2¹⁴ = 21423547627 is a prime.

Together with 21423564013, 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 (21423564013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711782005 + 10711782006.

It is an arithmetic number, because the mean of its divisors is an integer number (10711782006).

Almost surely, 2^21423564011 is an apocalyptic number.

21423564011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423564011 is an equidigital number, since it uses as much as digits as its factorization.

21423564011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21423564011 in words is "twenty-one billion, four hundred twenty-three million, five hundred sixty-four thousand, eleven".