12201000001221 has 4 divisors (see below), whose sum is σ = 16268000001632. Its totient is φ = 8134000000812.

The previous prime is 12201000001189. The next prime is 12201000001241. The reversal of 12201000001221 is 12210000010221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12201000001221 - 2⁵ = 12201000001189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201000001197 and 12201000001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201000001241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033500000201 + ... + 2033500000206.

It is an arithmetic number, because the mean of its divisors is an integer number (4067000000408).

Almost surely, 2^{12201000001221} is an apocalyptic number.

It is an amenable number.

12201000001221 is a deficient number, since it is larger than the sum of its proper divisors (4067000000411).

12201000001221 is an equidigital number, since it uses as much as digits as its factorization.

12201000001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067000000410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12201000001221 its reverse (12210000010221), we get a palindrome (24411000011442).

The spelling of 12201000001221 in words is "twelve trillion, two hundred one billion, one thousand, two hundred twenty-one".