42521868 has 24 divisors (see below), whose sum is σ = 110242160. Its totient is φ = 14173920.

The previous prime is 42521861. The next prime is 42521903. The reversal of 42521868 is 86812524.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (42521861) 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, 196753 + ... + 196968.

Almost surely, 2^42521868 is an apocalyptic number.

It is an amenable number.

42521868 is an abundant number, since it is smaller than the sum of its proper divisors (67720292).

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

42521868 is a wasteful number, since it uses less digits than its factorization.

42521868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393734 (or 393726 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 42521868 is about 6520.8793885488. The cubic root of 42521868 is about 349.0364463597.

The spelling of 42521868 in words is "forty-two million, five hundred twenty-one thousand, eight hundred sixty-eight".