42521321 has 8 divisors (see below), whose sum is σ = 42961440. Its totient is φ = 42083712.

The previous prime is 42521299. The next prime is 42521329. The reversal of 42521321 is 12312524.

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 42521321 - 2²² = 38327017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42521293 and 42521302.

It is not an unprimeable number, because it can be changed into a prime (42521329) 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, 57170 + ... + 57908.

It is an arithmetic number, because the mean of its divisors is an integer number (5370180).

Almost surely, 2^42521321 is an apocalyptic number.

It is an amenable number.

42521321 is a deficient number, since it is larger than the sum of its proper divisors (440119).

42521321 is a wasteful number, since it uses less digits than its factorization.

42521321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255.

The product of its digits is 480, while the sum is 20.

The square root of 42521321 is about 6520.8374462181. The cubic root of 42521321 is about 349.0349496886.

Adding to 42521321 its reverse (12312524), we get a palindrome (54833845).

The spelling of 42521321 in words is "forty-two million, five hundred twenty-one thousand, three hundred twenty-one".