42122221 has 8 divisors (see below), whose sum is σ = 44528000. Its totient is φ = 39735360.

The previous prime is 42122207. The next prime is 42122231. The reversal of 42122221 is 12222124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42122221 - 2⁵ = 42122189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42122195 and 42122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42122231) 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, 21 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (5566000).

Almost surely, 2^42122221 is an apocalyptic number.

It is an amenable number.

42122221 is a deficient number, since it is larger than the sum of its proper divisors (2405779).

42122221 is a wasteful number, since it uses less digits than its factorization.

42122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459.

The product of its digits is 128, while the sum is 16.

The square root of 42122221 is about 6490.1634031818. The cubic root of 42122221 is about 347.9395152950.

Adding to 42122221 its reverse (12222124), we get a palindrome (54344345).

The spelling of 42122221 in words is "forty-two million, one hundred twenty-two thousand, two hundred twenty-one".