42211221 has 16 divisors (see below), whose sum is σ = 64177344. Its totient is φ = 24447744.

The previous prime is 42211219. The next prime is 42211259. The reversal of 42211221 is 12211224.

It is not a de Polignac number, because 42211221 - 2¹ = 42211219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42211261) 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 15 ways as a sum of consecutive naturals, for example, 31171 + ... + 32496.

It is an arithmetic number, because the mean of its divisors is an integer number (4011084).

Almost surely, 2^42211221 is an apocalyptic number.

It is an amenable number.

42211221 is a deficient number, since it is larger than the sum of its proper divisors (21966123).

42211221 is a wasteful number, since it uses less digits than its factorization.

42211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63700.

The product of its digits is 64, while the sum is 15.

The square root of 42211221 is about 6497.0163152019. The cubic root of 42211221 is about 348.1843965945.

Adding to 42211221 its reverse (12211224), we get a palindrome (54422445).

The spelling of 42211221 in words is "forty-two million, two hundred eleven thousand, two hundred twenty-one".