21210213212223 has 24 divisors (see below), whose sum is σ = 34832619060912. Its totient is φ = 11407173490944.

The previous prime is 21210213212219. The next prime is 21210213212339. The reversal of 21210213212223 is 32221231201212.

It is not a de Polignac number, because 21210213212223 - 2² = 21210213212219 is a prime.

It is a super-2 number, since 2×21210213212223² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210213212193 and 21210213212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210213210223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4243737640 + ... + 4243742637.

It is an arithmetic number, because the mean of its divisors is an integer number (1451359127538).

Almost surely, 2^{21210213212223} is an apocalyptic number.

21210213212223 is a deficient number, since it is larger than the sum of its proper divisors (13622405848689).

21210213212223 is a wasteful number, since it uses less digits than its factorization.

21210213212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8487480311 (or 8487480304 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21210213212223 its reverse (32221231201212), we get a palindrome (53431444413435).

The spelling of 21210213212223 in words is "twenty-one trillion, two hundred ten billion, two hundred thirteen million, two hundred twelve thousand, two hundred twenty-three".