12211321221 has 48 divisors (see below), whose sum is σ = 20409667200. Its totient is φ = 6953256960.

The previous prime is 12211321219. The next prime is 12211321237. The reversal of 12211321221 is 12212311221.

12211321221 is a `hidden beast` number, since 122 + 1 + 1 + 321 + 221 = 666.

It is not a de Polignac number, because 12211321221 - 2¹ = 12211321219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12211321194 and 12211321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211341221) 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, 1002061 + ... + 1014173.

It is an arithmetic number, because the mean of its divisors is an integer number (425201400).

Almost surely, 2^12211321221 is an apocalyptic number.

12211321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211321221 is a deficient number, since it is larger than the sum of its proper divisors (8198345979).

12211321221 is a wasteful number, since it uses less digits than its factorization.

12211321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12746 (or 12743 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 12211321221 its reverse (12212311221), we get a palindrome (24423632442).

The spelling of 12211321221 in words is "twelve billion, two hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".