42222220 has 24 divisors (see below), whose sum is σ = 93883104. Its totient is φ = 15895296.

The previous prime is 42222139. The next prime is 42222221. The reversal of 42222220 is 2222224.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 42222194 and 42222203.

It is not an unprimeable number, because it can be changed into a prime (42222221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61752 + ... + 62431.

It is an arithmetic number, because the mean of its divisors is an integer number (3911796).

Almost surely, 2^42222220 is an apocalyptic number.

It is an amenable number.

42222220 is an abundant number, since it is smaller than the sum of its proper divisors (51660884).

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

42222220 is a wasteful number, since it uses less digits than its factorization.

42222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124209 (or 124207 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42222220 is about 6497.8627255429. The cubic root of 42222220 is about 348.2146361651.

Adding to 42222220 its reverse (2222224), we get a palindrome (44444444).

The spelling of 42222220 in words is "forty-two million, two hundred twenty-two thousand, two hundred twenty".