42121406620 has 12 divisors (see below), whose sum is σ = 88454953944. Its totient is φ = 16848562640.

The previous prime is 42121406599. The next prime is 42121406623. The reversal of 42121406620 is 2660412124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121406623) 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 3 ways as a sum of consecutive naturals, for example, 1053035146 + ... + 1053035185.

It is an arithmetic number, because the mean of its divisors is an integer number (7371246162).

Almost surely, 2^42121406620 is an apocalyptic number.

It is an amenable number.

42121406620 is an abundant number, since it is smaller than the sum of its proper divisors (46333547324).

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

42121406620 is a wasteful number, since it uses less digits than its factorization.

42121406620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106070340 (or 2106070338 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 42121406620 its reverse (2660412124), we get a palindrome (44781818744).

The spelling of 42121406620 in words is "forty-two billion, one hundred twenty-one million, four hundred six thousand, six hundred twenty".