10001217220 has 12 divisors (see below), whose sum is σ = 21002556204. Its totient is φ = 4000486880.

The previous prime is 10001217209. The next prime is 10001217229. The reversal of 10001217220 is 2271210001.

It can be written as a sum of positive squares in 2 ways, for example, as 3513881284 + 6487335936 = 59278^2 + 80544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10001217194 and 10001217203.

It is not an unprimeable number, because it can be changed into a prime (10001217229) 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, 250030411 + ... + 250030450.

It is an arithmetic number, because the mean of its divisors is an integer number (1750213017).

Almost surely, 2^10001217220 is an apocalyptic number.

10001217220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001217220 is an abundant number, since it is smaller than the sum of its proper divisors (11001338984).

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

10001217220 is a wasteful number, since it uses less digits than its factorization.

10001217220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500060870 (or 500060868 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 10001217220 its reverse (2271210001), we get a palindrome (12272427221).

The spelling of 10001217220 in words is "ten billion, one million, two hundred seventeen thousand, two hundred twenty".