42124321 has 4 divisors (see below), whose sum is σ = 42308500. Its totient is φ = 41940144.

The previous prime is 42124309. The next prime is 42124333. The reversal of 42124321 is 12342124.

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

It is an interprime number because it is at equal distance from previous prime (42124309) and next prime (42124333).

It can be written as a sum of positive squares in 2 ways, for example, as 28515600 + 13608721 = 5340^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 42124321 - 2⁷ = 42124193 is a prime.

It is a super-2 number, since 2×42124321² = 3548916839422082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42124721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91746 + ... + 92203.

It is an arithmetic number, because the mean of its divisors is an integer number (10577125).

Almost surely, 2^42124321 is an apocalyptic number.

It is an amenable number.

42124321 is a deficient number, since it is larger than the sum of its proper divisors (184179).

42124321 is a wasteful number, since it uses less digits than its factorization.

42124321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184178.

The product of its digits is 384, while the sum is 19.

The square root of 42124321 is about 6490.3251844572. The cubic root of 42124321 is about 347.9452973646.

Adding to 42124321 its reverse (12342124), we get a palindrome (54466445).

It can be divided in two parts, 421 and 24321, that added together give a palindrome (24742).

The spelling of 42124321 in words is "forty-two million, one hundred twenty-four thousand, three hundred twenty-one".