42121420530 has 256 divisors, whose sum is σ = 127436267520. Its totient is φ = 8687720448.

The previous prime is 42121420529. The next prime is 42121420609. The reversal of 42121420530 is 3502412124.

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 42121420530.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 25419462 + ... + 25421118.

It is an arithmetic number, because the mean of its divisors is an integer number (497797920).

Almost surely, 2^42121420530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42121420530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63718133760).

42121420530 is an abundant number, since it is smaller than the sum of its proper divisors (85314846990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42121420530 is a wasteful number, since it uses less digits than its factorization.

42121420530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 42121420530 its reverse (3502412124), we get a palindrome (45623832654).

The spelling of 42121420530 in words is "forty-two billion, one hundred twenty-one million, four hundred twenty thousand, five hundred thirty".