42222222225 has 36 divisors (see below), whose sum is σ = 75711276316. Its totient is φ = 22492736640.

The previous prime is 42222222223. The next prime is 42222222241. The reversal of 42222222225 is 52222222224.

It can be written as a sum of positive squares in 6 ways, for example, as 6095237184 + 36126985041 = 78072^2 + 190071^2 .

It is not a de Polignac number, because 42222222225 - 2¹ = 42222222223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42222222223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90339 + ... + 304311.

Almost surely, 2^42222222225 is an apocalyptic number.

42222222225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42222222225 is a deficient number, since it is larger than the sum of its proper divisors (33489054091).

42222222225 is a wasteful number, since it uses less digits than its factorization.

42222222225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214866 (or 214858 counting only the distinct ones).

The product of its digits is 10240, while the sum is 27.

Adding to 42222222225 its reverse (52222222224), we get a palindrome (94444444449).

Subtracting 42222222225 from its reverse (52222222224), we obtain a palindrome (9999999999).

The spelling of 42222222225 in words is "forty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-five".