1721052220 has 12 divisors (see below), whose sum is σ = 3614209704. Its totient is φ = 688420880.

The previous prime is 1721052187. The next prime is 1721052233. The reversal of 1721052220 is 222501271.

It is a junction number, because it is equal to n+sod(n) for n = 1721052191 and 1721052200.

It is a congruent number.

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, 43026286 + ... + 43026325.

It is an arithmetic number, because the mean of its divisors is an integer number (301184142).

Almost surely, 2^1721052220 is an apocalyptic number.

1721052220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721052220 is an abundant number, since it is smaller than the sum of its proper divisors (1893157484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721052220 is a wasteful number, since it uses less digits than its factorization.

1721052220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86052620 (or 86052618 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 1721052220 is about 41485.5664056790. The cubic root of 1721052220 is about 1198.3895572880.

Adding to 1721052220 its reverse (222501271), we get a palindrome (1943553491).

The spelling of 1721052220 in words is "one billion, seven hundred twenty-one million, fifty-two thousand, two hundred twenty".