42502221 has 24 divisors (see below), whose sum is σ = 65000000. Its totient is φ = 26687232.

The previous prime is 42502157. The next prime is 42502223. The reversal of 42502221 is 12220524.

It is not a de Polignac number, because 42502221 - 2⁶ = 42502157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42502194 and 42502203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42502223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33405 + ... + 34653.

Almost surely, 2^42502221 is an apocalyptic number.

It is an amenable number.

42502221 is a deficient number, since it is larger than the sum of its proper divisors (22497779).

42502221 is a wasteful number, since it uses less digits than its factorization.

42502221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 42502221 is about 6519.3727459012. The cubic root of 42502221 is about 348.9826812751.

Adding to 42502221 its reverse (12220524), we get a palindrome (54722745).

The spelling of 42502221 in words is "forty-two million, five hundred two thousand, two hundred twenty-one".