42265221 has 8 divisors (see below), whose sum is σ = 57417120. Its totient is φ = 27645072.

The previous prime is 42265207. The next prime is 42265231. The reversal of 42265221 is 12256224.

It is a happy number.

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

It is not a de Polignac number, because 42265221 - 2¹³ = 42257029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42265191 and 42265200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42265231) 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 7 ways as a sum of consecutive naturals, for example, 132751 + ... + 133068.

It is an arithmetic number, because the mean of its divisors is an integer number (7177140).

Almost surely, 2^42265221 is an apocalyptic number.

It is an amenable number.

42265221 is a deficient number, since it is larger than the sum of its proper divisors (15151899).

42265221 is a wasteful number, since it uses less digits than its factorization.

42265221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265875.

The product of its digits is 1920, while the sum is 24.

The square root of 42265221 is about 6501.1707407205. The cubic root of 42265221 is about 348.3328085175.

It can be divided in two parts, 42265 and 221, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 42265221 in words is "forty-two million, two hundred sixty-five thousand, two hundred twenty-one".