42101523 has 36 divisors (see below), whose sum is σ = 65563680. Its totient is φ = 26012448.

The previous prime is 42101513. The next prime is 42101531. The reversal of 42101523 is 32510124.

42101523 is a `hidden beast` number, since 42 + 101 + 523 = 666.

It is not a de Polignac number, because 42101523 - 2¹⁴ = 42085139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42101496 and 42101505.

It is not an unprimeable number, because it can be changed into a prime (42101513) 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 35 ways as a sum of consecutive naturals, for example, 176038 + ... + 176276.

Almost surely, 2^42101523 is an apocalyptic number.

42101523 is a deficient number, since it is larger than the sum of its proper divisors (23462157).

42101523 is a wasteful number, since it uses less digits than its factorization.

42101523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42101523 is about 6488.5686403089. The cubic root of 42101523 is about 347.8825158315.

Adding to 42101523 its reverse (32510124), we get a palindrome (74611647).

It can be divided in two parts, 42101 and 523, that added together give a palindrome (42624).

The spelling of 42101523 in words is "forty-two million, one hundred one thousand, five hundred twenty-three".