21802855223 has 2 divisors, whose sum is σ = 21802855224. Its totient is φ = 21802855222.

The previous prime is 21802855199. The next prime is 21802855247. The reversal of 21802855223 is 32255820812.

It is a balanced prime because it is at equal distance from previous prime (21802855199) and next prime (21802855247).

It is a cyclic number.

It is not a de Polignac number, because 21802855223 - 2⁸ = 21802854967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21802855423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10901427611 + 10901427612.

It is an arithmetic number, because the mean of its divisors is an integer number (10901427612).

Almost surely, 2^21802855223 is an apocalyptic number.

21802855223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21802855223 is an equidigital number, since it uses as much as digits as its factorization.

21802855223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 21802855223 in words is "twenty-one billion, eight hundred two million, eight hundred fifty-five thousand, two hundred twenty-three".