12102101021221 has 4 divisors (see below), whose sum is σ = 12102188075244. Its totient is φ = 12102013967200.

The previous prime is 12102101021191. The next prime is 12102101021291. The reversal of 12102101021221 is 12212010120121.

12102101021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6113557898721 + 5988543122500 = 2472561^2 + 2447150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102101021221 - 2¹⁹ = 12102100496933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102101021195 and 12102101021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102101021291) 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, 43318150 + ... + 43596631.

It is an arithmetic number, because the mean of its divisors is an integer number (3025547018811).

Almost surely, 2^{12102101021221} is an apocalyptic number.

It is an amenable number.

12102101021221 is a deficient number, since it is larger than the sum of its proper divisors (87054023).

12102101021221 is an equidigital number, since it uses as much as digits as its factorization.

12102101021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87054022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12102101021221 its reverse (12212010120121), we get a palindrome (24314111141342).

The spelling of 12102101021221 in words is "twelve trillion, one hundred two billion, one hundred one million, twenty-one thousand, two hundred twenty-one".