42121444 has 24 divisors (see below), whose sum is σ = 78834168. Its totient is φ = 19622400.

The previous prime is 42121399. The next prime is 42121459. The reversal of 42121444 is 44412124.

It can be written as a sum of positive squares in 4 ways, for example, as 34668544 + 7452900 = 5888^2 + 2730^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3802 + ... + 9934.

It is an arithmetic number, because the mean of its divisors is an integer number (3284757).

Almost surely, 2^42121444 is an apocalyptic number.

It is an amenable number.

42121444 is a deficient number, since it is larger than the sum of its proper divisors (36712724).

42121444 is a wasteful number, since it uses less digits than its factorization.

42121444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6255 (or 6253 counting only the distinct ones).

The product of its digits is 1024, while the sum is 22.

The square root of 42121444 is about 6490.1035430877. The cubic root of 42121444 is about 347.9373758805.

Adding to 42121444 its reverse (44412124), we get a palindrome (86533568).

The spelling of 42121444 in words is "forty-two million, one hundred twenty-one thousand, four hundred forty-four".