12213123021 has 72 divisors (see below), whose sum is σ = 19679063040. Its totient is φ = 7292799360.

The previous prime is 12213123001. The next prime is 12213123049. The reversal of 12213123021 is 12032131221.

It is not a de Polignac number, because 12213123021 - 2¹⁹ = 12212598733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12213122985 and 12213123003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213123001) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32224410 + ... + 32224788.

It is an arithmetic number, because the mean of its divisors is an integer number (273320320).

Almost surely, 2^12213123021 is an apocalyptic number.

12213123021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12213123021 is a deficient number, since it is larger than the sum of its proper divisors (7465940019).

12213123021 is a wasteful number, since it uses less digits than its factorization.

12213123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12213123021 its reverse (12032131221), we get a palindrome (24245254242).

The spelling of 12213123021 in words is "twelve billion, two hundred thirteen million, one hundred twenty-three thousand, twenty-one".