42221212 has 24 divisors (see below), whose sum is σ = 80946432. Its totient is φ = 19110000.

The previous prime is 42221209. The next prime is 42221219. The reversal of 42221212 is 21212224.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221219) 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, 9133 + ... + 12955.

It is an arithmetic number, because the mean of its divisors is an integer number (3372768).

Almost surely, 2^42221212 is an apocalyptic number.

It is an amenable number.

42221212 is a deficient number, since it is larger than the sum of its proper divisors (38725220).

42221212 is a wasteful number, since it uses less digits than its factorization.

42221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089 (or 4087 counting only the distinct ones).

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

The square root of 42221212 is about 6497.7851611145. The cubic root of 42221212 is about 348.2118650875.

Adding to 42221212 its reverse (21212224), we get a palindrome (63433436).

It can be divided in two parts, 422212 and 12, that added together give a palindrome (422224).

The spelling of 42221212 in words is "forty-two million, two hundred twenty-one thousand, two hundred twelve".