12103213221 has 12 divisors (see below), whose sum is σ = 19071730080. Its totient is φ = 7335280680.

The previous prime is 12103213211. The next prime is 12103213229. The reversal of 12103213221 is 12231230121.

12103213221 is a `hidden beast` number, since 1 + 21 + 0 + 321 + 322 + 1 = 666.

It is not a de Polignac number, because 12103213221 - 2¹⁴ = 12103196837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12103213194 and 12103213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12103213229) 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, 61127241 + ... + 61127438.

It is an arithmetic number, because the mean of its divisors is an integer number (1589310840).

Almost surely, 2^12103213221 is an apocalyptic number.

12103213221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12103213221 is a deficient number, since it is larger than the sum of its proper divisors (6968516859).

12103213221 is a wasteful number, since it uses less digits than its factorization.

12103213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122254696 (or 122254693 counting only the distinct ones).

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

Adding to 12103213221 its reverse (12231230121), we get a palindrome (24334443342).

The spelling of 12103213221 in words is "twelve billion, one hundred three million, two hundred thirteen thousand, two hundred twenty-one".