2721226 has 4 divisors (see below), whose sum is σ = 4081842.
Its totient is φ = 1360612.
The previous prime is 2721223. The next prime is 2721227. The reversal of 2721226 is 6221272.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 2719201 + 2025 = 1649^2 + 45^2
It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a junction number, because it is equal to n+sod(n) for n = 2721197 and 2721206.
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 as a sum of consecutive naturals, namely, 680305 + ... + 680308.
22721226 is an apocalyptic number.
2721226 is a deficient number, since it is larger than the sum of its proper divisors (1360616).
2721226 is a wasteful number, since it uses less digits than its factorization.
2721226 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1360615.
The product of its digits is 672, while the sum is 22.
The square root of 2721226 is about 1649.6138942189.
The cubic root of 2721226 is about 139.6116105974.
Adding to 2721226 its reverse (6221272), we get a palindrome (8942498).
The spelling of 2721226 in words is "two million, seven hundred twenty-one thousand, two hundred twenty-six".