1221222000121 has 2 divisors, whose sum is σ = 1221222000122. Its totient is φ = 1221222000120.

The previous prime is 1221222000113. The next prime is 1221222000161. The reversal of 1221222000121 is 1210002221221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 930308475625 + 290913524496 = 964525^2 + 539364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221222000121 - 2³ = 1221222000113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221222000095 and 1221222000104.

It is not a weakly prime, because it can be changed into another prime (1221222000161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611000060 + 610611000061.

It is an arithmetic number, because the mean of its divisors is an integer number (610611000061).

Almost surely, 2^{1221222000121} is an apocalyptic number.

It is an amenable number.

1221222000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222000121 is an equidigital number, since it uses as much as digits as its factorization.

1221222000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221222000121 its reverse (1210002221221), we get a palindrome (2431224221342).

The spelling of 1221222000121 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one", and thus it is an aban number.