66021222 has 8 divisors (see below), whose sum is σ = 132042456. Its totient is φ = 22007072.

The previous prime is 66021187. The next prime is 66021239. The reversal of 66021222 is 22212066.

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

66021222 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5501763 + ... + 5501774.

It is an arithmetic number, because the mean of its divisors is an integer number (16505307).

Almost surely, 2^66021222 is an apocalyptic number.

66021222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66021222 is a wasteful number, since it uses less digits than its factorization.

66021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11003542.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 66021222 is about 8125.3444234691. The cubic root of 66021222 is about 404.1673121658.

Adding to 66021222 its reverse (22212066), we get a palindrome (88233288).

The spelling of 66021222 in words is "sixty-six million, twenty-one thousand, two hundred twenty-two".