42122220 has 48 divisors (see below), whose sum is σ = 134792448. Its totient is φ = 9627840.

The previous prime is 42122207. The next prime is 42122231. The reversal of 42122220 is 2222124.

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 42122220.

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, 49726 + ... + 50565.

It is an arithmetic number, because the mean of its divisors is an integer number (2808176).

Almost surely, 2^42122220 is an apocalyptic number.

It is an amenable number.

42122220 is an abundant number, since it is smaller than the sum of its proper divisors (92670228).

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

42122220 is a wasteful number, since it uses less digits than its factorization.

42122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100310 (or 100308 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42122220 is about 6490.1633261421. The cubic root of 42122220 is about 347.9395125416.

Adding to 42122220 its reverse (2222124), we get a palindrome (44344344).

The spelling of 42122220 in words is "forty-two million, one hundred twenty-two thousand, two hundred twenty".