100121210 has 24 divisors (see below), whose sum is σ = 209642580. Its totient is φ = 34327104.

The previous prime is 100121201. The next prime is 100121213. The reversal of 100121210 is 12121001.

It can be written as a sum of positive squares in 2 ways, for example, as 90763729 + 9357481 = 9527^2 + 3059^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101675 + ... + 102654.

Almost surely, 2^100121210 is an apocalyptic number.

100121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100121210 is an abundant number, since it is smaller than the sum of its proper divisors (109521370).

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

100121210 is a wasteful number, since it uses less digits than its factorization.

100121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204350 (or 204343 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100121210 is about 10006.0586646291. The cubic root of 100121210 is about 464.3463433024.

Adding to 100121210 its reverse (12121001), we get a palindrome (112242211).

The spelling of 100121210 in words is "one hundred million, one hundred twenty-one thousand, two hundred ten".