42120162221 has 2 divisors, whose sum is σ = 42120162222. Its totient is φ = 42120162220.

The previous prime is 42120162199. The next prime is 42120162233. The reversal of 42120162221 is 12226102124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42019260196 + 100902025 = 204986^2 + 10045^2 .

It is a cyclic number.

It is not a de Polignac number, because 42120162221 - 2³⁰ = 41046420397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42120165221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060081110 + 21060081111.

It is an arithmetic number, because the mean of its divisors is an integer number (21060081111).

Almost surely, 2^42120162221 is an apocalyptic number.

It is an amenable number.

42120162221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120162221 is an equidigital number, since it uses as much as digits as its factorization.

42120162221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 42120162221 its reverse (12226102124), we get a palindrome (54346264345).

The spelling of 42120162221 in words is "forty-two billion, one hundred twenty million, one hundred sixty-two thousand, two hundred twenty-one".