42054243121 has 4 divisors (see below), whose sum is σ = 45877356144. Its totient is φ = 38231130100.

The previous prime is 42054243103. The next prime is 42054243131. The reversal of 42054243121 is 12134245024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42054243121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42054243121.

It is not an unprimeable number, because it can be changed into a prime (42054243131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1911556495 + ... + 1911556516.

It is an arithmetic number, because the mean of its divisors is an integer number (11469339036).

Almost surely, 2^42054243121 is an apocalyptic number.

It is an amenable number.

42054243121 is a deficient number, since it is larger than the sum of its proper divisors (3823113023).

42054243121 is a wasteful number, since it uses less digits than its factorization.

42054243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823113022.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 42054243121 its reverse (12134245024), we get a palindrome (54188488145).

The spelling of 42054243121 in words is "forty-two billion, fifty-four million, two hundred forty-three thousand, one hundred twenty-one".