21355066223 has 2 divisors, whose sum is σ = 21355066224. Its totient is φ = 21355066222.

The previous prime is 21355066219. The next prime is 21355066247. The reversal of 21355066223 is 32266055312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21355066223 - 2² = 21355066219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355066253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677533111 + 10677533112.

It is an arithmetic number, because the mean of its divisors is an integer number (10677533112).

Almost surely, 2^21355066223 is an apocalyptic number.

21355066223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355066223 is an equidigital number, since it uses as much as digits as its factorization.

21355066223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 21355066223 in words is "twenty-one billion, three hundred fifty-five million, sixty-six thousand, two hundred twenty-three".