42453421 has 4 divisors (see below), whose sum is σ = 42964992. Its totient is φ = 41941852.

The previous prime is 42453413. The next prime is 42453451. The reversal of 42453421 is 12435424.

It is a happy number.

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 42453421 - 2³ = 42453413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42453401) 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, 255661 + ... + 255826.

It is an arithmetic number, because the mean of its divisors is an integer number (10741248).

Almost surely, 2^42453421 is an apocalyptic number.

It is an amenable number.

42453421 is a deficient number, since it is larger than the sum of its proper divisors (511571).

42453421 is an equidigital number, since it uses as much as digits as its factorization.

42453421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511570.

The product of its digits is 3840, while the sum is 25.

The square root of 42453421 is about 6515.6289796151. The cubic root of 42453421 is about 348.8490656934.

Adding to 42453421 its reverse (12435424), we get a palindrome (54888845).

The spelling of 42453421 in words is "forty-two million, four hundred fifty-three thousand, four hundred twenty-one".