42220225 has 6 divisors (see below), whose sum is σ = 52353110. Its totient is φ = 33776160.

The previous prime is 42220177. The next prime is 42220229. The reversal of 42220225 is 52202224.

It can be written as a sum of positive squares in 3 ways, for example, as 9216 + 42211009 = 96^2 + 6497^2 .

It is not a de Polignac number, because 42220225 - 2¹³ = 42212033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42220229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 844380 + ... + 844429.

Almost surely, 2^42220225 is an apocalyptic number.

It is an amenable number.

42220225 is a deficient number, since it is larger than the sum of its proper divisors (10132885).

42220225 is a wasteful number, since it uses less digits than its factorization.

42220225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688819 (or 1688814 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42220225 is about 6497.7092117145. The cubic root of 42220225 is about 348.2091516979.

Adding to 42220225 its reverse (52202224), we get a palindrome (94422449).

The spelling of 42220225 in words is "forty-two million, two hundred twenty thousand, two hundred twenty-five".