12021103021221 has 16 divisors (see below), whose sum is σ = 20353190300800. Its totient is φ = 6869201726304.

The previous prime is 12021103021177. The next prime is 12021103021253. The reversal of 12021103021221 is 12212030112021.

12021103021221 is a `hidden beast` number, since 120 + 21 + 1 + 0 + 302 + 1 + 221 = 666.

It is not a de Polignac number, because 12021103021221 - 2¹⁹ = 12021102496933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021103021194 and 12021103021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021103021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31801859656 + ... + 31801860033.

It is an arithmetic number, because the mean of its divisors is an integer number (1272074393800).

Almost surely, 2^{12021103021221} is an apocalyptic number.

It is an amenable number.

12021103021221 is a deficient number, since it is larger than the sum of its proper divisors (8332087279579).

12021103021221 is an equidigital number, since it uses as much as digits as its factorization.

12021103021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63603719705 (or 63603719699 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 12021103021221 its reverse (12212030112021), we get a palindrome (24233133133242).

The spelling of 12021103021221 in words is "twelve trillion, twenty-one billion, one hundred three million, twenty-one thousand, two hundred twenty-one".