42231220 has 24 divisors (see below), whose sum is σ = 92542464. Its totient is φ = 16157856.

The previous prime is 42231191. The next prime is 42231223. The reversal of 42231220 is 2213224.

It is a junction number, because it is equal to n+sod(n) for n = 42231194 and 42231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42231223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45444 + ... + 46363.

It is an arithmetic number, because the mean of its divisors is an integer number (3855936).

Almost surely, 2^42231220 is an apocalyptic number.

It is an amenable number.

42231220 is an abundant number, since it is smaller than the sum of its proper divisors (50311244).

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

42231220 is a wasteful number, since it uses less digits than its factorization.

42231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91839 (or 91837 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42231220 is about 6498.5552240479. Note that the first 3 decimals coincide. The cubic root of 42231220 is about 348.2393759749.

Adding to 42231220 its reverse (2213224), we get a palindrome (44444444).

The spelling of 42231220 in words is "forty-two million, two hundred thirty-one thousand, two hundred twenty".