21000211223 has 2 divisors, whose sum is σ = 21000211224. Its totient is φ = 21000211222.

The previous prime is 21000211207. The next prime is 21000211237. The reversal of 21000211223 is 32211200012.

It is a happy number.

It is an a-pointer prime, because the next prime (21000211237) can be obtained adding 21000211223 to its sum of digits (14).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000211223 - 2⁴ = 21000211207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000211198 and 21000211207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000211523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500105611 + 10500105612.

It is an arithmetic number, because the mean of its divisors is an integer number (10500105612).

Almost surely, 2^21000211223 is an apocalyptic number.

21000211223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000211223 is an equidigital number, since it uses as much as digits as its factorization.

21000211223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21000211223 its reverse (32211200012), we get a palindrome (53211411235).

The spelling of 21000211223 in words is "twenty-one billion, two hundred eleven thousand, two hundred twenty-three".