42220221 has 16 divisors (see below), whose sum is σ = 57346560. Its totient is φ = 27624240.

The previous prime is 42220177. The next prime is 42220229. The reversal of 42220221 is 12202224.

42220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42220221 - 2⁷ = 42220093 is a prime.

It is a super-2 number, since 2×42220221² = 3565094122577682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42220229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80466 + ... + 80988.

It is an arithmetic number, because the mean of its divisors is an integer number (3584160).

Almost surely, 2^42220221 is an apocalyptic number.

It is an amenable number.

42220221 is a deficient number, since it is larger than the sum of its proper divisors (15126339).

42220221 is a wasteful number, since it uses less digits than its factorization.

42220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

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

The square root of 42220221 is about 6497.7089039137. The cubic root of 42220221 is about 348.2091407013.

Adding to 42220221 its reverse (12202224), we get a palindrome (54422445).

The spelling of 42220221 in words is "forty-two million, two hundred twenty thousand, two hundred twenty-one".