100212220 has 24 divisors (see below), whose sum is σ = 212814000. Its totient is φ = 39633792.

The previous prime is 100212163. The next prime is 100212223. The reversal of 100212220 is 22212001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 100212197 and 100212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26370 + ... + 29929.

It is an arithmetic number, because the mean of its divisors is an integer number (8867250).

Almost surely, 2^100212220 is an apocalyptic number.

100212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100212220 is an abundant number, since it is smaller than the sum of its proper divisors (112601780).

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

100212220 is a wasteful number, since it uses less digits than its factorization.

100212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56397 (or 56395 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 100212220 is about 10010.6053762997. The cubic root of 100212220 is about 464.4869973569.

Adding to 100212220 its reverse (22212001), we get a palindrome (122424221).

The spelling of 100212220 in words is "one hundred million, two hundred twelve thousand, two hundred twenty".