42525122221 has 2 divisors, whose sum is σ = 42525122222. Its totient is φ = 42525122220.

The previous prime is 42525122201. The next prime is 42525122231. The reversal of 42525122221 is 12222152524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25104818025 + 17420304196 = 158445^2 + 131986^2 .

It is a cyclic number.

It is not a de Polignac number, because 42525122221 - 2¹³ = 42525114029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42525122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42525122201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21262561110 + 21262561111.

It is an arithmetic number, because the mean of its divisors is an integer number (21262561111).

Almost surely, 2^42525122221 is an apocalyptic number.

It is an amenable number.

42525122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42525122221 is an equidigital number, since it uses as much as digits as its factorization.

42525122221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 28.

Adding to 42525122221 its reverse (12222152524), we get a palindrome (54747274745).

The spelling of 42525122221 in words is "forty-two billion, five hundred twenty-five million, one hundred twenty-two thousand, two hundred twenty-one".