42521255 has 16 divisors (see below), whose sum is σ = 58543104. Its totient is φ = 29043360.

The previous prime is 42521249. The next prime is 42521291. The reversal of 42521255 is 55212524.

It is not a de Polignac number, because 42521255 - 2⁶ = 42521191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7244 + ... + 11726.

It is an arithmetic number, because the mean of its divisors is an integer number (3658944).

Almost surely, 2^42521255 is an apocalyptic number.

42521255 is a deficient number, since it is larger than the sum of its proper divisors (16021849).

42521255 is a wasteful number, since it uses less digits than its factorization.

42521255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766.

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

The square root of 42521255 is about 6520.8323855164. The cubic root of 42521255 is about 349.0347691022.

Adding to 42521255 its reverse (55212524), we get a palindrome (97733779).

It can be divided in two parts, 425 and 21255, that multiplied together give a triangular number (9033375 = T₄₂₅₀).

The spelling of 42521255 in words is "forty-two million, five hundred twenty-one thousand, two hundred fifty-five".