12211121201 has 4 divisors (see below), whose sum is σ = 12348324900. Its totient is φ = 12073917504.

The previous prime is 12211121171. The next prime is 12211121207. The reversal of 12211121201 is 10212111221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10212111221 = 13 ⋅785547017.

It can be written as a sum of positive squares in 2 ways, for example, as 5259730576 + 6951390625 = 72524^2 + 83375^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211121201 - 2¹⁸ = 12210859057 is a prime.

It is a super-2 number, since 2×12211121201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211121207) 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, 68601716 + ... + 68601893.

It is an arithmetic number, because the mean of its divisors is an integer number (3087081225).

Almost surely, 2^12211121201 is an apocalyptic number.

It is an amenable number.

12211121201 is a deficient number, since it is larger than the sum of its proper divisors (137203699).

12211121201 is an equidigital number, since it uses as much as digits as its factorization.

12211121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137203698.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12211121201 its reverse (10212111221), we get a palindrome (22423232422).

The spelling of 12211121201 in words is "twelve billion, two hundred eleven million, one hundred twenty-one thousand, two hundred one".