222216621 has 24 divisors (see below), whose sum is σ = 329082432. Its totient is φ = 133267200.

The previous prime is 222216607. The next prime is 222216623. The reversal of 222216621 is 126612222.

It is a happy number.

It is not a de Polignac number, because 222216621 - 2⁶ = 222216557 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222216591 and 222216600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222216623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32056 + ... + 38366.

It is an arithmetic number, because the mean of its divisors is an integer number (13711768).

Almost surely, 2^222216621 is an apocalyptic number.

It is an amenable number.

222216621 is a deficient number, since it is larger than the sum of its proper divisors (106865811).

222216621 is a wasteful number, since it uses less digits than its factorization.

222216621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6433 (or 6422 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 222216621 is about 14906.9319781100. The cubic root of 222216621 is about 605.7017751865.

Adding to 222216621 its reverse (126612222), we get a palindrome (348828843).

The spelling of 222216621 in words is "two hundred twenty-two million, two hundred sixteen thousand, six hundred twenty-one".