42423121 has 12 divisors (see below), whose sum is σ = 46500636. Its totient is φ = 38473920.

The previous prime is 42423119. The next prime is 42423133. The reversal of 42423121 is 12132424.

It can be written as a sum of positive squares in 6 ways, for example, as 13950225 + 28472896 = 3735^2 + 5336^2 .

It is not a de Polignac number, because 42423121 - 2¹ = 42423119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42423421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47935 + ... + 48811.

It is an arithmetic number, because the mean of its divisors is an integer number (3875053).

Almost surely, 2^42423121 is an apocalyptic number.

It is an amenable number.

42423121 is a deficient number, since it is larger than the sum of its proper divisors (4077515).

42423121 is an equidigital number, since it uses as much as digits as its factorization.

42423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 951 counting only the distinct ones).

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

The square root of 42423121 is about 6513.3033861475. The cubic root of 42423121 is about 348.7660520268.

Adding to 42423121 its reverse (12132424), we get a palindrome (54555545).

The spelling of 42423121 in words is "forty-two million, four hundred twenty-three thousand, one hundred twenty-one".