42121020 has 24 divisors (see below), whose sum is σ = 117939024. Its totient is φ = 11232256.

The previous prime is 42121007. The next prime is 42121067. The reversal of 42121020 is 2012124.

42121020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 42120987 and 42121005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350949 + ... + 351068.

It is an arithmetic number, because the mean of its divisors is an integer number (4914126).

Almost surely, 2^42121020 is an apocalyptic number.

It is an amenable number.

42121020 is an abundant number, since it is smaller than the sum of its proper divisors (75818004).

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

42121020 is a wasteful number, since it uses less digits than its factorization.

42121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702029 (or 702027 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 42121020 is about 6490.0708778872. The cubic root of 42121020 is about 347.9362084155.

Adding to 42121020 its reverse (2012124), we get a palindrome (44133144).

The spelling of 42121020 in words is "forty-two million, one hundred twenty-one thousand, twenty".