42221525 has 6 divisors (see below), whose sum is σ = 52354722. Its totient is φ = 33777200.

The previous prime is 42221467. The next prime is 42221527. The reversal of 42221525 is 52512224.

It can be written as a sum of positive squares in 3 ways, for example, as 9480241 + 32741284 = 3079^2 + 5722^2 .

It is not a de Polignac number, because 42221525 - 2⁸ = 42221269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42221525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 844406 + ... + 844455.

It is an arithmetic number, because the mean of its divisors is an integer number (8725787).

Almost surely, 2^42221525 is an apocalyptic number.

It is an amenable number.

42221525 is a deficient number, since it is larger than the sum of its proper divisors (10133197).

42221525 is a wasteful number, since it uses less digits than its factorization.

42221525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688871 (or 1688866 counting only the distinct ones).

The product of its digits is 1600, while the sum is 23.

The square root of 42221525 is about 6497.8092461998. The cubic root of 42221525 is about 348.2127255558.

Adding to 42221525 its reverse (52512224), we get a palindrome (94733749).

The spelling of 42221525 in words is "forty-two million, two hundred twenty-one thousand, five hundred twenty-five".