220721446 has 8 divisors (see below), whose sum is σ = 361180584. Its totient is φ = 100327920.

The previous prime is 220721443. The next prime is 220721467. The reversal of 220721446 is 644127022.

It is a happy number.

220721446 is digitally balanced in base 3, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (220721441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5016375 + ... + 5016418.

It is an arithmetic number, because the mean of its divisors is an integer number (45147573).

Almost surely, 2^220721446 is an apocalyptic number.

220721446 is a deficient number, since it is larger than the sum of its proper divisors (140459138).

220721446 is a wasteful number, since it uses less digits than its factorization.

220721446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10032806.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 220721446 is about 14856.6970084201. The cubic root of 220721446 is about 604.3402374537.

Adding to 220721446 its reverse (644127022), we get a palindrome (864848468).

It can be divided in two parts, 2207 and 21446, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 220721446 in words is "two hundred twenty million, seven hundred twenty-one thousand, four hundred forty-six".