42131220 has 48 divisors (see below), whose sum is σ = 119595840. Its totient is φ = 11079936.

The previous prime is 42131183. The next prime is 42131267. The reversal of 42131220 is 2213124.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 42131220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430 + ... + 9189.

It is an arithmetic number, because the mean of its divisors is an integer number (2491580).

Almost surely, 2^42131220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59797920).

42131220 is an abundant number, since it is smaller than the sum of its proper divisors (77464620).

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

42131220 is a wasteful number, since it uses less digits than its factorization.

42131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9704 (or 9702 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 42131220 is about 6490.8566460830. The cubic root of 42131220 is about 347.9642914873.

Adding to 42131220 its reverse (2213124), we get a palindrome (44344344).

The spelling of 42131220 in words is "forty-two million, one hundred thirty-one thousand, two hundred twenty".