12101213001221 has 4 divisors (see below), whose sum is σ = 12101268388332. Its totient is φ = 12101157614112.

The previous prime is 12101213001179. The next prime is 12101213001233. The reversal of 12101213001221 is 12210031210121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2969121856996 + 9132091144225 = 1723114^2 + 3021935^2 .

It is a cyclic number.

It is not a de Polignac number, because 12101213001221 - 2²² = 12101208806917 is a prime.

It is a super-2 number, since 2×12101213001221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12101213001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101213001271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27364526 + ... + 27803231.

It is an arithmetic number, because the mean of its divisors is an integer number (3025317097083).

Almost surely, 2^{12101213001221} is an apocalyptic number.

It is an amenable number.

12101213001221 is a deficient number, since it is larger than the sum of its proper divisors (55387111).

12101213001221 is an equidigital number, since it uses as much as digits as its factorization.

12101213001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55387110.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 12101213001221 its reverse (12210031210121), we get a palindrome (24311244211342).

The spelling of 12101213001221 in words is "twelve trillion, one hundred one billion, two hundred thirteen million, one thousand, two hundred twenty-one".