42210525 has 96 divisors (see below), whose sum is σ = 85494528. Its totient is φ = 17971200.
The previous prime is 42210523. The next prime is 42210529. The reversal of 42210525 is 52501224.
It is a happy number.
It is not a de Polignac number, because 42210525 - 21 = 42210523 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (21).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42210521) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 796399 + ... + 796451.
It is an arithmetic number, because the mean of its divisors is an integer number (890568).
Almost surely, 242210525 is an apocalyptic number.
It is an amenable number.
42210525 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
42210525 is a wasteful number, since it uses less digits than its factorization.
42210525 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 151 (or 146 counting only the distinct ones).
The product of its (nonzero) digits is 800, while the sum is 21.
The square root of 42210525 is about 6496.9627519326. The cubic root of 42210525 is about 348.1824829037.
Adding to 42210525 its reverse (52501224), we get a palindrome (94711749).
The spelling of 42210525 in words is "forty-two million, two hundred ten thousand, five hundred twenty-five".
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