12100011021221 has 4 divisors (see below), whose sum is σ = 12100218175872. Its totient is φ = 12099803866572.

The previous prime is 12100011021097. The next prime is 12100011021229. The reversal of 12100011021221 is 12212011000121.

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 a cyclic number.

It is not a de Polignac number, because 12100011021221 - 2³⁰ = 12098937279397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100011021196 and 12100011021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100011021229) 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, 103489685 + ... + 103606538.

It is an arithmetic number, because the mean of its divisors is an integer number (3025054543968).

Almost surely, 2^{12100011021221} is an apocalyptic number.

It is an amenable number.

12100011021221 is a deficient number, since it is larger than the sum of its proper divisors (207154651).

12100011021221 is an equidigital number, since it uses as much as digits as its factorization.

12100011021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207154650.

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

Adding to 12100011021221 its reverse (12212011000121), we get a palindrome (24312022021342).

The spelling of 12100011021221 in words is "twelve trillion, one hundred billion, eleven million, twenty-one thousand, two hundred twenty-one".