42121352420 has 48 divisors (see below), whose sum is σ = 101102940288. Its totient is φ = 14439936000.

The previous prime is 42121352401. The next prime is 42121352423. The reversal of 42121352420 is 2425312124.

It is a self number, because there is not a number n which added to its sum of digits gives 42121352420.

It is not an unprimeable number, because it can be changed into a prime (42121352423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2230739 + ... + 2249541.

It is an arithmetic number, because the mean of its divisors is an integer number (2106311256).

Almost surely, 2^42121352420 is an apocalyptic number.

It is an amenable number.

42121352420 is an abundant number, since it is smaller than the sum of its proper divisors (58981587868).

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

42121352420 is a wasteful number, since it uses less digits than its factorization.

42121352420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34820 (or 34818 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 42121352420 its reverse (2425312124), we get a palindrome (44546664544).

The spelling of 42121352420 in words is "forty-two billion, one hundred twenty-one million, three hundred fifty-two thousand, four hundred twenty".