42421251 has 8 divisors (see below), whose sum is σ = 57406144. Its totient is φ = 27858600.

The previous prime is 42421241. The next prime is 42421279. The reversal of 42421251 is 15212424.

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

It is not a de Polignac number, because 42421251 - 2⁵ = 42421219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42421201) 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, 105325 + ... + 105726.

It is an arithmetic number, because the mean of its divisors is an integer number (7175768).

Almost surely, 2^42421251 is an apocalyptic number.

42421251 is a deficient number, since it is larger than the sum of its proper divisors (14984893).

42421251 is a wasteful number, since it uses less digits than its factorization.

42421251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211121.

The product of its digits is 640, while the sum is 21.

The square root of 42421251 is about 6513.1598322166. The cubic root of 42421251 is about 348.7609274463.

Adding to 42421251 its reverse (15212424), we get a palindrome (57633675).

The spelling of 42421251 in words is "forty-two million, four hundred twenty-one thousand, two hundred fifty-one".