12221111121021 has 32 divisors (see below), whose sum is σ = 19776842547840. Its totient is φ = 7397152070400.

The previous prime is 12221111121019. The next prime is 12221111121157. The reversal of 12221111121021 is 12012111112221.

It is a happy number.

It is not a de Polignac number, because 12221111121021 - 2¹ = 12221111121019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221111120985 and 12221111121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221111122021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26386540 + ... + 26845701.

It is an arithmetic number, because the mean of its divisors is an integer number (618026329620).

Almost surely, 2^{12221111121021} is an apocalyptic number.

12221111121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221111121021 is a deficient number, since it is larger than the sum of its proper divisors (7555731426819).

12221111121021 is a wasteful number, since it uses less digits than its factorization.

12221111121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53233034 (or 53233028 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12221111121021 its reverse (12012111112221), we get a palindrome (24233222233242).

The spelling of 12221111121021 in words is "twelve trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".