42120522 has 12 divisors (see below), whose sum is σ = 91261170. Its totient is φ = 14040168.

The previous prime is 42120517. The next prime is 42120523. The reversal of 42120522 is 22502124.

It can be written as a sum of positive squares in only one way, i.e., 34117281 + 8003241 = 5841^2 + 2829^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2340029 = 42120522 / (4 + 2 + 1 + 2 + 0 + 5 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 42120495 and 42120504.

It is not an unprimeable number, because it can be changed into a prime (42120523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1169997 + ... + 1170032.

Almost surely, 2^42120522 is an apocalyptic number.

42120522 is an abundant number, since it is smaller than the sum of its proper divisors (49140648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42120522 is a wasteful number, since it uses less digits than its factorization.

42120522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340037 (or 2340034 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 42120522 is about 6490.0325114748. The cubic root of 42120522 is about 347.9348371847.

Adding to 42120522 its reverse (22502124), we get a palindrome (64622646).

The spelling of 42120522 in words is "forty-two million, one hundred twenty thousand, five hundred twenty-two".