21102102223 has 2 divisors, whose sum is σ = 21102102224. Its totient is φ = 21102102222.

The previous prime is 21102102199. The next prime is 21102102233. The reversal of 21102102223 is 32220120112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102102223 - 2¹³ = 21102094031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102102197 and 21102102206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102102233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551051111 + 10551051112.

It is an arithmetic number, because the mean of its divisors is an integer number (10551051112).

Almost surely, 2^21102102223 is an apocalyptic number.

21102102223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102102223 is an equidigital number, since it uses as much as digits as its factorization.

21102102223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21102102223 its reverse (32220120112), we get a palindrome (53322222335).

The spelling of 21102102223 in words is "twenty-one billion, one hundred two million, one hundred two thousand, two hundred twenty-three".