42012305251 has 4 divisors (see below), whose sum is σ = 48014063152. Its totient is φ = 36010547352.

The previous prime is 42012305219. The next prime is 42012305267. The reversal of 42012305251 is 15250321024.

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

It is a cyclic number.

It is not a de Polignac number, because 42012305251 - 2⁵ = 42012305219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42012305281) 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, 3000878940 + ... + 3000878953.

It is an arithmetic number, because the mean of its divisors is an integer number (12003515788).

Almost surely, 2^42012305251 is an apocalyptic number.

42012305251 is a deficient number, since it is larger than the sum of its proper divisors (6001757901).

42012305251 is an equidigital number, since it uses as much as digits as its factorization.

42012305251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001757900.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 42012305251 its reverse (15250321024), we get a palindrome (57262626275).

The spelling of 42012305251 in words is "forty-two billion, twelve million, three hundred five thousand, two hundred fifty-one".