42021122 has 72 divisors (see below), whose sum is σ = 80874108. Its totient is φ = 16251840.

The previous prime is 42021121. The next prime is 42021139. The reversal of 42021122 is 22112024.

It can be written as a sum of positive squares in 2 ways, for example, as 41977441 + 43681 = 6479^2 + 209^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42021097 and 42021106.

It is not an unprimeable number, because it can be changed into a prime (42021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1135688 + ... + 1135724.

Almost surely, 2^42021122 is an apocalyptic number.

42021122 is a deficient number, since it is larger than the sum of its proper divisors (38852986).

42021122 is a wasteful number, since it uses less digits than its factorization.

42021122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 42021122 is about 6482.3700912552. The cubic root of 42021122 is about 347.6609250683.

Adding to 42021122 its reverse (22112024), we get a palindrome (64133146).

The spelling of 42021122 in words is "forty-two million, twenty-one thousand, one hundred twenty-two".