42050002121 has 4 divisors (see below), whose sum is σ = 42642255744. Its totient is φ = 41457748500.

The previous prime is 42050002097. The next prime is 42050002123. The reversal of 42050002121 is 12120005024.

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-42050002121 is a prime.

It is a super-2 number, since 2×42050002121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42050002121.

It is not an unprimeable number, because it can be changed into a prime (42050002123) 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, 296126705 + ... + 296126846.

It is an arithmetic number, because the mean of its divisors is an integer number (10660563936).

Almost surely, 2^42050002121 is an apocalyptic number.

It is an amenable number.

42050002121 is a deficient number, since it is larger than the sum of its proper divisors (592253623).

42050002121 is an equidigital number, since it uses as much as digits as its factorization.

42050002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592253622.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 42050002121 its reverse (12120005024), we get a palindrome (54170007145).

The spelling of 42050002121 in words is "forty-two billion, fifty million, two thousand, one hundred twenty-one".