100211220 has 72 divisors (see below), whose sum is σ = 313797120. Its totient is φ = 25859520.

The previous prime is 100211183. The next prime is 100211231. The reversal of 100211220 is 22112001.

It is a super-2 number, since 2×100211220² = 20084577227776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3400 + ... + 14559.

Almost surely, 2^100211220 is an apocalyptic number.

100211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100211220 is an abundant number, since it is smaller than the sum of its proper divisors (213585900).

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

100211220 is a wasteful number, since it uses less digits than its factorization.

100211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18005 (or 18000 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 100211220 is about 10010.5554291458. Note that the first 3 decimals coincide. The cubic root of 100211220 is about 464.4854523406.

Adding to 100211220 its reverse (22112001), we get a palindrome (122323221).

The spelling of 100211220 in words is "one hundred million, two hundred eleven thousand, two hundred twenty".