2721222 has 64 divisors (see below), whose sum is σ = 7234560.
Its totient is φ = 741312.
The previous prime is 2721197. The next prime is 2721223. The reversal of 2721222 is 2221272.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a nude number because it is divisible by every one of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 2721195 and 2721204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2721223) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8538 + ... + 8850.
It is an arithmetic number, because the mean of its divisors is an integer number (113040).
22721222 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2721222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3617280).
2721222 is an abundant number, since it is smaller than the sum of its proper divisors (4513338).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2721222 is a wasteful number, since it uses less digits than its factorization.
2721222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 354 (or 348 counting only the distinct ones).
The product of its digits is 224, while the sum is 18.
The square root of 2721222 is about 1649.6126818135.
The cubic root of 2721222 is about 139.6115421912.
Adding to 2721222 its reverse (2221272), we get a palindrome (4942494).
The spelling of 2721222 in words is "two million, seven hundred twenty-one thousand, two hundred twenty-two".