220445521 has 8 divisors (see below), whose sum is σ = 225680000. Its totient is φ = 215263440.

The previous prime is 220445513. The next prime is 220445539. The reversal of 220445521 is 125544022.

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 220445521 - 2³ = 220445513 is a prime.

It is a super-2 number, since 2×220445521² = 97192455457922882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220445551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521 + ... + 21478.

It is an arithmetic number, because the mean of its divisors is an integer number (28210000).

Almost surely, 2^220445521 is an apocalyptic number.

It is an amenable number.

220445521 is a deficient number, since it is larger than the sum of its proper divisors (5234479).

220445521 is a wasteful number, since it uses less digits than its factorization.

220445521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26199.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 220445521 is about 14847.4078882477. The cubic root of 220445521 is about 604.0883028435.

Adding to 220445521 its reverse (125544022), we get a palindrome (345989543).

The spelling of 220445521 in words is "two hundred twenty million, four hundred forty-five thousand, five hundred twenty-one".