42131242042 has 4 divisors (see below), whose sum is σ = 63196863066. Its totient is φ = 21065621020.

The previous prime is 42131242009. The next prime is 42131242099. The reversal of 42131242042 is 24024213124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 33926324481 + 8204917561 = 184191^2 + 90581^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42131241998 and 42131242016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532810509 + ... + 10532810512.

Almost surely, 2^42131242042 is an apocalyptic number.

42131242042 is a deficient number, since it is larger than the sum of its proper divisors (21065621024).

42131242042 is a wasteful number, since it uses less digits than its factorization.

42131242042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21065621023.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 42131242042 its reverse (24024213124), we get a palindrome (66155455166).

The spelling of 42131242042 in words is "forty-two billion, one hundred thirty-one million, two hundred forty-two thousand, forty-two".