12100100021221 has 4 divisors (see below), whose sum is σ = 12141397291212. Its totient is φ = 12058802751232.

The previous prime is 12100100021213. The next prime is 12100100021249. The reversal of 12100100021221 is 12212000100121.

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 4809749016996 + 7290351004225 = 2193114^2 + 2700065^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100100021221 - 2³ = 12100100021213 is a prime.

It is a super-4 number, since 4×12100100021221⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100100021021) 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, 20648634556 + ... + 20648635141.

It is an arithmetic number, because the mean of its divisors is an integer number (3035349322803).

Almost surely, 2^{12100100021221} is an apocalyptic number.

It is an amenable number.

12100100021221 is a deficient number, since it is larger than the sum of its proper divisors (41297269991).

12100100021221 is an equidigital number, since it uses as much as digits as its factorization.

12100100021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41297269990.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12100100021221 its reverse (12212000100121), we get a palindrome (24312100121342).

The spelling of 12100100021221 in words is "twelve trillion, one hundred billion, one hundred million, twenty-one thousand, two hundred twenty-one".