21211010212223 has 12 divisors (see below), whose sum is σ = 23502278008440. Its totient is φ = 19124059290336.

The previous prime is 21211010212211. The next prime is 21211010212361. The reversal of 21211010212223 is 32221201011212.

It is not a de Polignac number, because 21211010212223 - 2¹⁰ = 21211010211199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211010212195 and 21211010212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211010212123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1459398968 + ... + 1459413501.

It is an arithmetic number, because the mean of its divisors is an integer number (1958523167370).

Almost surely, 2^{21211010212223} is an apocalyptic number.

21211010212223 is a deficient number, since it is larger than the sum of its proper divisors (2291267796217).

21211010212223 is a wasteful number, since it uses less digits than its factorization.

21211010212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918812538 (or 2918812525 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21211010212223 its reverse (32221201011212), we get a palindrome (53432211223435).

The spelling of 21211010212223 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred twelve thousand, two hundred twenty-three".