12221211120021 has 24 divisors (see below), whose sum is σ = 18017880338016. Its totient is φ = 7979549491680.

The previous prime is 12221211119969. The next prime is 12221211120029. The reversal of 12221211120021 is 12002111212221.

12221211120021 is a `hidden beast` number, since 12 + 221 + 211 + 1 + 200 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12221211120021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221211119976 and 12221211120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221211120029) 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 23 ways as a sum of consecutive naturals, for example, 22485435 + ... + 23022536.

It is an arithmetic number, because the mean of its divisors is an integer number (750745014084).

Almost surely, 2^{12221211120021} is an apocalyptic number.

It is an amenable number.

12221211120021 is a deficient number, since it is larger than the sum of its proper divisors (5796669217995).

12221211120021 is a wasteful number, since it uses less digits than its factorization.

12221211120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45508593 (or 45508590 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12221211120021 its reverse (12002111212221), we get a palindrome (24223322332242).

The spelling of 12221211120021 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty thousand, twenty-one".