22220220016921 has 2 divisors, whose sum is σ = 22220220016922. Its totient is φ = 22220220016920.

The previous prime is 22220220016913. The next prime is 22220220016927. The reversal of 22220220016921 is 12961002202222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14062770001296 + 8157450015625 = 3750036^2 + 2856125^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220220016921 - 2³ = 22220220016913 is a prime.

It is not a weakly prime, because it can be changed into another prime (22220220016927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110110008460 + 11110110008461.

It is an arithmetic number, because the mean of its divisors is an integer number (11110110008461).

Almost surely, 2^{22220220016921} is an apocalyptic number.

It is an amenable number.

22220220016921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220220016921 is an equidigital number, since it uses as much as digits as its factorization.

22220220016921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 22220220016921 in words is "twenty-two trillion, two hundred twenty billion, two hundred twenty million, sixteen thousand, nine hundred twenty-one".