42112421 has 4 divisors (see below), whose sum is σ = 45351852. Its totient is φ = 38872992.

The previous prime is 42112409. The next prime is 42112463. The reversal of 42112421 is 12421124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 23716900 = 4289^2 + 4870^2 .

It is a cyclic number.

It is not a de Polignac number, because 42112421 - 2¹⁴ = 42096037 is a prime.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 42112421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42112481) 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 3 ways as a sum of consecutive naturals, for example, 1619696 + ... + 1619721.

It is an arithmetic number, because the mean of its divisors is an integer number (11337963).

Almost surely, 2^42112421 is an apocalyptic number.

It is an amenable number.

42112421 is a deficient number, since it is larger than the sum of its proper divisors (3239431).

42112421 is a wasteful number, since it uses less digits than its factorization.

42112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239430.

The product of its digits is 128, while the sum is 17.

The square root of 42112421 is about 6489.4083705682. The cubic root of 42112421 is about 347.9125297622.

Adding to 42112421 its reverse (12421124), we get a palindrome (54533545).

The spelling of 42112421 in words is "forty-two million, one hundred twelve thousand, four hundred twenty-one".