42212122 has 16 divisors (see below), whose sum is σ = 68145192. Its totient is φ = 19537920.

The previous prime is 42212113. The next prime is 42212143. The reversal of 42212122 is 22121224.

It can be written as a sum of positive squares in 4 ways, for example, as 28291761 + 13920361 = 5319^2 + 3731^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42212096 and 42212105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8103 + ... + 12250.

Almost surely, 2^42212122 is an apocalyptic number.

42212122 is a deficient number, since it is larger than the sum of its proper divisors (25933070).

42212122 is a wasteful number, since it uses less digits than its factorization.

42212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20433.

The product of its digits is 128, while the sum is 16.

The square root of 42212122 is about 6497.0856543530. The cubic root of 42212122 is about 348.1868739129.

Adding to 42212122 its reverse (22121224), we get a palindrome (64333346).

It can be divided in two parts, 422 and 12122, that added together give a square (12544 = 112²).

The spelling of 42212122 in words is "forty-two million, two hundred twelve thousand, one hundred twenty-two".