672222221 has 4 divisors (see below), whose sum is σ = 733333344. Its totient is φ = 611111100.

The previous prime is 672222217. The next prime is 672222227. The reversal of 672222221 is 122222276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 672222221 - 2² = 672222217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672222227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30555545 + ... + 30555566.

It is an arithmetic number, because the mean of its divisors is an integer number (183333336).

Almost surely, 2^672222221 is an apocalyptic number.

It is an amenable number.

672222221 is a deficient number, since it is larger than the sum of its proper divisors (61111123).

672222221 is a wasteful number, since it uses less digits than its factorization.

672222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61111122.

The product of its digits is 2688, while the sum is 26.

The square root of 672222221 is about 25927.2486199365. The cubic root of 672222221 is about 876.0003670515. Note that the first 3 decimals are identical.

Adding to 672222221 its reverse (122222276), we get a palindrome (794444497).

Subtracting from 672222221 its reverse (122222276), we obtain a palindrome (549999945).

It can be divided in two parts, 6 and 72222221, that added together give a palindrome (72222227).

The spelling of 672222221 in words is "six hundred seventy-two million, two hundred twenty-two thousand, two hundred twenty-one".