42005022121 has 4 divisors (see below), whose sum is σ = 42114696192. Its totient is φ = 41895348052.

The previous prime is 42005022089. The next prime is 42005022127. The reversal of 42005022121 is 12122050024.

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 not a de Polignac number, because 42005022121 - 2⁵ = 42005022089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42005022127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54836461 + ... + 54837226.

It is an arithmetic number, because the mean of its divisors is an integer number (10528674048).

Almost surely, 2^42005022121 is an apocalyptic number.

It is an amenable number.

42005022121 is a deficient number, since it is larger than the sum of its proper divisors (109674071).

42005022121 is a wasteful number, since it uses less digits than its factorization.

42005022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109674070.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 42005022121 its reverse (12122050024), we get a palindrome (54127072145).

The spelling of 42005022121 in words is "forty-two billion, five million, twenty-two thousand, one hundred twenty-one".