12213203121 has 48 divisors (see below), whose sum is σ = 21443595264. Its totient is φ = 6538862592.

The previous prime is 12213203117. The next prime is 12213203129. The reversal of 12213203121 is 12130231221.

12213203121 is a `hidden beast` number, since 1 + 221 + 320 + 3 + 121 = 666.

It is not a de Polignac number, because 12213203121 - 2² = 12213203117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12213203094 and 12213203103.

It is not an unprimeable number, because it can be changed into a prime (12213203129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 213265 + ... + 264401.

It is an arithmetic number, because the mean of its divisors is an integer number (446741568).

Almost surely, 2^12213203121 is an apocalyptic number.

It is an amenable number.

12213203121 is a deficient number, since it is larger than the sum of its proper divisors (9230392143).

12213203121 is a wasteful number, since it uses less digits than its factorization.

12213203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51390 (or 51387 counting only the distinct ones).

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

Adding to 12213203121 its reverse (12130231221), we get a palindrome (24343434342).

The spelling of 12213203121 in words is "twelve billion, two hundred thirteen million, two hundred three thousand, one hundred twenty-one".