100011220 has 24 divisors (see below), whose sum is σ = 210254184. Its totient is φ = 39960576.

The previous prime is 100011217. The next prime is 100011271. The reversal of 100011220 is 22110001.

It can be written as a sum of positive squares in 4 ways, for example, as 1882384 + 98128836 = 1372^2 + 9906^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20892 + ... + 25228.

It is an arithmetic number, because the mean of its divisors is an integer number (8760591).

Almost surely, 2^100011220 is an apocalyptic number.

100011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100011220 is an abundant number, since it is smaller than the sum of its proper divisors (110242964).

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

100011220 is a wasteful number, since it uses less digits than its factorization.

100011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499 (or 5497 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 100011220 is about 10000.5609842648. The cubic root of 100011220 is about 464.1762422543.

Adding to 100011220 its reverse (22110001), we get a palindrome (122121221).

The spelling of 100011220 in words is "one hundred million, eleven thousand, two hundred twenty".