2720221 has 8 divisors (see below), whose sum is σ = 3291840. Its totient is φ = 2194368.

The previous prime is 2720197. The next prime is 2720239. The reversal of 2720221 is 1220272.

2720221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2720221 - 2⁵ = 2720189 is a prime.

It is a Duffinian number.

2720221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2720195 and 2720204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11311 + ... + 11548.

It is an arithmetic number, because the mean of its divisors is an integer number (411480).

2^2720221 is an apocalyptic number.

It is an amenable number.

2720221 is a deficient number, since it is larger than the sum of its proper divisors (571619).

2720221 is a wasteful number, since it uses less digits than its factorization.

2720221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22883.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 2720221 is about 1649.3092493526. The cubic root of 2720221 is about 139.5944214157.

Adding to 2720221 its reverse (1220272), we get a palindrome (3940493).

The spelling of 2720221 in words is "two million, seven hundred twenty thousand, two hundred twenty-one".