42510421 has 8 divisors (see below), whose sum is σ = 45068184. Its totient is φ = 39959040.

The previous prime is 42510409. The next prime is 42510427. The reversal of 42510421 is 12401524.

It can be written as a sum of positive squares in 4 ways, for example, as 29268100 + 13242321 = 5410^2 + 3639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42510421 - 2⁵ = 42510389 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 (42510427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23841 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (5633523).

Almost surely, 2^42510421 is an apocalyptic number.

It is an amenable number.

42510421 is a deficient number, since it is larger than the sum of its proper divisors (2557763).

42510421 is a wasteful number, since it uses less digits than its factorization.

42510421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42510421 is about 6520.0016104292. The cubic root of 42510421 is about 349.0051230354.

Adding to 42510421 its reverse (12401524), we get a palindrome (54911945).

The spelling of 42510421 in words is "forty-two million, five hundred ten thousand, four hundred twenty-one".