20212222121173 has 2 divisors, whose sum is σ = 20212222121174. Its totient is φ = 20212222121172.

The previous prime is 20212222121099. The next prime is 20212222121207. The reversal of 20212222121173 is 37112122221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15033470799204 + 5178751321969 = 3877302^2 + 2275687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212222121173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212262121173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106111060586 + 10106111060587.

It is an arithmetic number, because the mean of its divisors is an integer number (10106111060587).

Almost surely, 2^{20212222121173} is an apocalyptic number.

It is an amenable number.

20212222121173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212222121173 is an equidigital number, since it uses as much as digits as its factorization.

20212222121173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 20212222121173 its reverse (37112122221202), we get a palindrome (57324344342375).

The spelling of 20212222121173 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred seventy-three".