222821712 has 80 divisors (see below), whose sum is σ = 647776000. Its totient is φ = 73322496.

The previous prime is 222821681. The next prime is 222821713. The reversal of 222821712 is 217128222.

It is a super-2 number, since 2×222821712² = 99299030677221888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222821713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30864 + ... + 37392.

It is an arithmetic number, because the mean of its divisors is an integer number (8097200).

Almost surely, 2^222821712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222821712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323888000).

222821712 is an abundant number, since it is smaller than the sum of its proper divisors (424954288).

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

222821712 is a wasteful number, since it uses less digits than its factorization.

222821712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625 (or 6613 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 222821712 is about 14927.2138056638. The cubic root of 222821712 is about 606.2510478318.

Adding to 222821712 its reverse (217128222), we get a palindrome (439949934).

The spelling of 222821712 in words is "two hundred twenty-two million, eight hundred twenty-one thousand, seven hundred twelve".