12221022121021 has 4 divisors (see below), whose sum is σ = 13966882424032. Its totient is φ = 10475161818012.

The previous prime is 12221022121019. The next prime is 12221022121051. The reversal of 12221022121021 is 12012122012221.

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 12221022121021 - 2¹ = 12221022121019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12221022121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221022121051) 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, 872930151495 + ... + 872930151508.

It is an arithmetic number, because the mean of its divisors is an integer number (3491720606008).

Almost surely, 2^{12221022121021} is an apocalyptic number.

It is an amenable number.

12221022121021 is a deficient number, since it is larger than the sum of its proper divisors (1745860303011).

12221022121021 is an equidigital number, since it uses as much as digits as its factorization.

12221022121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745860303010.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12221022121021 its reverse (12012122012221), we get a palindrome (24233144133242).

The spelling of 12221022121021 in words is "twelve trillion, two hundred twenty-one billion, twenty-two million, one hundred twenty-one thousand, twenty-one".