42434021 has 4 divisors (see below), whose sum is σ = 48496032. Its totient is φ = 36372012.

The previous prime is 42434017. The next prime is 42434053. The reversal of 42434021 is 12043424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42434021 - 2² = 42434017 is a prime.

It is a super-2 number, since 2×42434021² = 3601292276456882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42433984 and 42434002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42434321) 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, 3030995 + ... + 3031008.

It is an arithmetic number, because the mean of its divisors is an integer number (12124008).

Almost surely, 2^42434021 is an apocalyptic number.

It is an amenable number.

42434021 is a deficient number, since it is larger than the sum of its proper divisors (6062011).

42434021 is an equidigital number, since it uses as much as digits as its factorization.

42434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6062010.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 42434021 is about 6514.1400813922. The cubic root of 42434021 is about 348.7959195797.

Adding to 42434021 its reverse (12043424), we get a palindrome (54477445).

The spelling of 42434021 in words is "forty-two million, four hundred thirty-four thousand, twenty-one".