42502421 has 8 divisors (see below), whose sum is σ = 46523064.
Its totient is φ = 38589120.
The previous prime is 42502417. The next prime is 42502451. The reversal of 42502421 is 12420524.
Adding to 42502421 its reverse (12420524), we get a palindrome (54922945).
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 835396 + 41667025 = 914^2 + 6455^2
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 42502421 - 22 = 42502417 is a prime.
It is a super-4 number, since 4×425024214 (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 42502393 and 42502402.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42502451) 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, 26006 + ... + 27591.
It is an arithmetic number, because the mean of its divisors is an integer number (5815383).
Almost surely, 242502421 is an apocalyptic number.
It is an amenable number.
42502421 is a deficient number, since it is larger than the sum of its proper divisors (4020643).
42502421 is a wasteful number, since it uses less digits than its factorization.
42502421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 53671.
The product of its (nonzero) digits is 640, while the sum is 20.
The square root of 42502421 is about 6519.3880847822.
The cubic root of 42502421 is about 348.9832286695.
The spelling of 42502421 in words is "forty-two million, five hundred two thousand, four hundred twenty-one".