42521412 has 12 divisors (see below), whose sum is σ = 99216656. Its totient is φ = 14173800.

The previous prime is 42521389. The next prime is 42521419. The reversal of 42521412 is 21412524.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (42521419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771714 + ... + 1771737.

Almost surely, 2^42521412 is an apocalyptic number.

It is an amenable number.

42521412 is an abundant number, since it is smaller than the sum of its proper divisors (56695244).

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

42521412 is a wasteful number, since it uses less digits than its factorization.

42521412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3543458 (or 3543456 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 42521412 is about 6520.8444238457. The cubic root of 42521412 is about 349.0351986787.

Adding to 42521412 its reverse (21412524), we get a palindrome (63933936).

The spelling of 42521412 in words is "forty-two million, five hundred twenty-one thousand, four hundred twelve".