220521872 has 20 divisors (see below), whose sum is σ = 427693980. Its totient is φ = 110149248.

The previous prime is 220521827. The next prime is 220521883. The reversal of 220521872 is 278125022.

It can be written as a sum of positive squares in 2 ways, for example, as 118026496 + 102495376 = 10864^2 + 10124^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10658 + ... + 23550.

It is an arithmetic number, because the mean of its divisors is an integer number (21384699).

Almost surely, 2^220521872 is an apocalyptic number.

It is an amenable number.

220521872 is a deficient number, since it is larger than the sum of its proper divisors (207172108).

220521872 is a wasteful number, since it uses less digits than its factorization.

220521872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13970 (or 13964 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 220521872 is about 14849.9788552038. The cubic root of 220521872 is about 604.1580365082.

Adding to 220521872 its reverse (278125022), we get a palindrome (498646894).

The spelling of 220521872 in words is "two hundred twenty million, five hundred twenty-one thousand, eight hundred seventy-two".