7890222022121 has 2 divisors, whose sum is σ = 7890222022122. Its totient is φ = 7890222022120.

The previous prime is 7890222022103. The next prime is 7890222022127. The reversal of 7890222022121 is 1212202220987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5343679489600 + 2546542532521 = 2311640^2 + 1595789^2 .

It is an emirp because it is prime and its reverse (1212202220987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7890222022121 - 2⁶ = 7890222022057 is a prime.

It is not a weakly prime, because it can be changed into another prime (7890222022127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3945111011060 + 3945111011061.

It is an arithmetic number, because the mean of its divisors is an integer number (3945111011061).

Almost surely, 2^{7890222022121} is an apocalyptic number.

It is an amenable number.

7890222022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7890222022121 is an equidigital number, since it uses as much as digits as its factorization.

7890222022121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 7890222022121 in words is "seven trillion, eight hundred ninety billion, two hundred twenty-two million, twenty-two thousand, one hundred twenty-one".