42521028 has 48 divisors (see below), whose sum is σ = 109105920. Its totient is φ = 12781600.

The previous prime is 42521027. The next prime is 42521077. The reversal of 42521028 is 82012524.

It is a junction number, because it is equal to n+sod(n) for n = 42520989 and 42521007.

It is not an unprimeable number, because it can be changed into a prime (42521021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16063 + ... + 18521.

It is an arithmetic number, because the mean of its divisors is an integer number (2273040).

Almost surely, 2^42521028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42521028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54552960).

42521028 is an abundant number, since it is smaller than the sum of its proper divisors (66584892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42521028 is a wasteful number, since it uses less digits than its factorization.

42521028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2606 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 42521028 is about 6520.8149797399. The cubic root of 42521028 is about 349.0341479930.

The spelling of 42521028 in words is "forty-two million, five hundred twenty-one thousand, twenty-eight".