42000021524 has 12 divisors (see below), whose sum is σ = 75871006848. Its totient is φ = 20322591000.

The previous prime is 42000021509. The next prime is 42000021571. The reversal of 42000021524 is 42512000024.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 42000021496 and 42000021505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169354802 + ... + 169355049.

It is an arithmetic number, because the mean of its divisors is an integer number (6322583904).

Almost surely, 2^42000021524 is an apocalyptic number.

It is an amenable number.

42000021524 is a deficient number, since it is larger than the sum of its proper divisors (33870985324).

42000021524 is a wasteful number, since it uses less digits than its factorization.

42000021524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338709886 (or 338709884 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 42000021524 its reverse (42512000024), we get a palindrome (84512021548).

The spelling of 42000021524 in words is "forty-two billion, twenty-one thousand, five hundred twenty-four".