21212221222323 has 16 divisors (see below), whose sum is σ = 32274851110560. Its totient is φ = 13759278630048.

The previous prime is 21212221222307. The next prime is 21212221222373. The reversal of 21212221222323 is 32322212221212.

21212221222323 is a `hidden beast` number, since 2 + 1 + 2 + 122 + 212 + 2 + 2 + 323 = 666.

It is not a de Polignac number, because 21212221222323 - 2⁴ = 21212221222307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21212221222373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10616726340 + ... + 10616728337.

It is an arithmetic number, because the mean of its divisors is an integer number (2017178194410).

Almost surely, 2^{21212221222323} is an apocalyptic number.

21212221222323 is a deficient number, since it is larger than the sum of its proper divisors (11062629888237).

21212221222323 is a wasteful number, since it uses less digits than its factorization.

21212221222323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21233454723 (or 21233454717 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21212221222323 its reverse (32322212221212), we get a palindrome (53534433443535).

The spelling of 21212221222323 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty-three".