42215525 has 12 divisors (see below), whose sum is σ = 57106464. Its totient is φ = 30702000.

The previous prime is 42215513. The next prime is 42215531. The reversal of 42215525 is 52551224.

It is not a de Polignac number, because 42215525 - 2⁸ = 42215269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42215494 and 42215503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76481 + ... + 77030.

It is an arithmetic number, because the mean of its divisors is an integer number (4758872).

Almost surely, 2^42215525 is an apocalyptic number.

It is an amenable number.

42215525 is a deficient number, since it is larger than the sum of its proper divisors (14890939).

42215525 is a wasteful number, since it uses less digits than its factorization.

42215525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153532 (or 153527 counting only the distinct ones).

The product of its digits is 4000, while the sum is 26.

The square root of 42215525 is about 6497.3475357256. The cubic root of 42215525 is about 348.1962302150.

Adding to 42215525 its reverse (52551224), we get a palindrome (94766749).

The spelling of 42215525 in words is "forty-two million, two hundred fifteen thousand, five hundred twenty-five".