12021321013221 has 64 divisors (see below), whose sum is σ = 18307766292480. Its totient is φ = 6955329669120.

The previous prime is 12021321013201. The next prime is 12021321013241. The reversal of 12021321013221 is 12231012312021.

It is an interprime number because it is at equal distance from previous prime (12021321013201) and next prime (12021321013241).

It is not a de Polignac number, because 12021321013221 - 2¹⁵ = 12021320980453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021321013201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78007381 + ... + 78161333.

It is an arithmetic number, because the mean of its divisors is an integer number (286058848320).

Almost surely, 2^{12021321013221} is an apocalyptic number.

It is an amenable number.

12021321013221 is a deficient number, since it is larger than the sum of its proper divisors (6286445279259).

12021321013221 is a wasteful number, since it uses less digits than its factorization.

12021321013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154786.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 12021321013221 its reverse (12231012312021), we get a palindrome (24252333325242).

The spelling of 12021321013221 in words is "twelve trillion, twenty-one billion, three hundred twenty-one million, thirteen thousand, two hundred twenty-one".