42521212 has 24 divisors (see below), whose sum is σ = 77396480. Its totient is φ = 20418480.

The previous prime is 42521203. The next prime is 42521231. The reversal of 42521212 is 21212524.

It is a self number, because there is not a number n which added to its sum of digits gives 42521212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16003 + ... + 18469.

Almost surely, 2^42521212 is an apocalyptic number.

It is an amenable number.

42521212 is a deficient number, since it is larger than the sum of its proper divisors (34875268).

42521212 is a wasteful number, since it uses less digits than its factorization.

42521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641 (or 2639 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 42521212 is about 6520.8290883905. The cubic root of 42521212 is about 349.0346514473.

Adding to 42521212 its reverse (21212524), we get a palindrome (63733736).

The spelling of 42521212 in words is "forty-two million, five hundred twenty-one thousand, two hundred twelve".