42240420251 has 8 divisors (see below), whose sum is σ = 44743064544. Its totient is φ = 39739766400.

The previous prime is 42240420239. The next prime is 42240420259. The reversal of 42240420251 is 15202404224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42240420251 - 2¹⁴ = 42240403867 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 42240420251.

It is not an unprimeable number, because it can be changed into a prime (42240420259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453800 + ... + 538901.

It is an arithmetic number, because the mean of its divisors is an integer number (5592883068).

Almost surely, 2^42240420251 is an apocalyptic number.

42240420251 is a deficient number, since it is larger than the sum of its proper divisors (2502644293).

42240420251 is a wasteful number, since it uses less digits than its factorization.

42240420251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995221.

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 42240420251 its reverse (15202404224), we get a palindrome (57442824475).

The spelling of 42240420251 in words is "forty-two billion, two hundred forty million, four hundred twenty thousand, two hundred fifty-one".