12221011220021 has 4 divisors (see below), whose sum is σ = 12221019562752. Its totient is φ = 12221002877292.

The previous prime is 12221011220009. The next prime is 12221011220057. The reversal of 12221011220021 is 12002211012221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12221011220021 - 2⁶ = 12221011219957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221011225021) 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, 1328021 + ... + 5119146.

It is an arithmetic number, because the mean of its divisors is an integer number (3055254890688).

Almost surely, 2^{12221011220021} is an apocalyptic number.

It is an amenable number.

12221011220021 is a deficient number, since it is larger than the sum of its proper divisors (8342731).

12221011220021 is an equidigital number, since it uses as much as digits as its factorization.

12221011220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342730.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12221011220021 its reverse (12002211012221), we get a palindrome (24223222232242).

The spelling of 12221011220021 in words is "twelve trillion, two hundred twenty-one billion, eleven million, two hundred twenty thousand, twenty-one".