42521642 has 8 divisors (see below), whose sum is σ = 63812100. Its totient is φ = 21250944.

The previous prime is 42521623. The next prime is 42521651. The reversal of 42521642 is 24612524.

It can be written as a sum of positive squares in 2 ways, for example, as 39702601 + 2819041 = 6301^2 + 1679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984 + ... + 9692.

Almost surely, 2^42521642 is an apocalyptic number.

42521642 is a deficient number, since it is larger than the sum of its proper divisors (21290458).

42521642 is a wasteful number, since it uses less digits than its factorization.

42521642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9880.

The product of its digits is 3840, while the sum is 26.

The square root of 42521642 is about 6520.8620595746. The cubic root of 42521642 is about 349.0358279926.

The spelling of 42521642 in words is "forty-two million, five hundred twenty-one thousand, six hundred forty-two".