42557421 has 8 divisors (see below), whose sum is σ = 56788704. Its totient is φ = 28348880.

The previous prime is 42557407. The next prime is 42557423. The reversal of 42557421 is 12475524.

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 42557421 - 2⁷ = 42557293 is a prime.

It is a super-2 number, since 2×42557421² = 3622268164342482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42557423) 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, 690 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (7098588).

Almost surely, 2^42557421 is an apocalyptic number.

It is an amenable number.

42557421 is a deficient number, since it is larger than the sum of its proper divisors (14231283).

42557421 is a wasteful number, since it uses less digits than its factorization.

42557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11371.

The product of its digits is 11200, while the sum is 30.

The square root of 42557421 is about 6523.6049083310. The cubic root of 42557421 is about 349.1336969937.

The spelling of 42557421 in words is "forty-two million, five hundred fifty-seven thousand, four hundred twenty-one".