42121223126 has 4 divisors (see below), whose sum is σ = 63181834692. Its totient is φ = 21060611562.

The previous prime is 42121223093. The next prime is 42121223129. The reversal of 42121223126 is 62132212124.

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

It is a junction number, because it is equal to n+sod(n) for n = 42121223095 and 42121223104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121223129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530305780 + ... + 10530305783.

It is an arithmetic number, because the mean of its divisors is an integer number (15795458673).

Almost surely, 2^42121223126 is an apocalyptic number.

42121223126 is a deficient number, since it is larger than the sum of its proper divisors (21060611566).

42121223126 is a wasteful number, since it uses less digits than its factorization.

42121223126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21060611565.

The product of its digits is 2304, while the sum is 26.

The spelling of 42121223126 in words is "forty-two billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-six".