42265521 has 12 divisors (see below), whose sum is σ = 61118148. Its totient is φ = 28145664.

The previous prime is 42265511. The next prime is 42265541. The reversal of 42265521 is 12556224.

42265521 is a `hidden beast` number, since 4 + 2 + 2 + 655 + 2 + 1 = 666.

42265521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18147600 + 24117921 = 4260^2 + 4911^2 .

It is not a de Polignac number, because 42265521 - 2¹⁵ = 42232753 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42265511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8341 + ... + 12413.

It is an arithmetic number, because the mean of its divisors is an integer number (5093179).

Almost surely, 2^42265521 is an apocalyptic number.

It is an amenable number.

42265521 is a deficient number, since it is larger than the sum of its proper divisors (18852627).

42265521 is a wasteful number, since it uses less digits than its factorization.

42265521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232 (or 5229 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 42265521 is about 6501.1938134469. The cubic root of 42265521 is about 348.3336326750. Note that the first 3 decimals are identical.

The spelling of 42265521 in words is "forty-two million, two hundred sixty-five thousand, five hundred twenty-one".