42917421 has 4 divisors (see below), whose sum is σ = 57223232. Its totient is φ = 28611612.

The previous prime is 42917417. The next prime is 42917429. The reversal of 42917421 is 12471924.

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 not a de Polignac number, because 42917421 - 2² = 42917417 is a prime.

It is a super-5 number, since 5×42917421⁵ (a number of 39 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42917429) 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, 7152901 + ... + 7152906.

It is an arithmetic number, because the mean of its divisors is an integer number (14305808).

Almost surely, 2^42917421 is an apocalyptic number.

It is an amenable number.

42917421 is a deficient number, since it is larger than the sum of its proper divisors (14305811).

42917421 is a wasteful number, since it uses less digits than its factorization.

42917421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14305810.

The product of its digits is 4032, while the sum is 30.

The square root of 42917421 is about 6551.1389086173. The cubic root of 42917421 is about 350.1153932438.

The spelling of 42917421 in words is "forty-two million, nine hundred seventeen thousand, four hundred twenty-one".