2100231220 has 24 divisors (see below), whose sum is σ = 4482791208. Its totient is φ = 826320000.

The previous prime is 2100231193. The next prime is 2100231239. The reversal of 2100231220 is 221320012.

It can be written as a sum of positive squares in 4 ways, for example, as 163175076 + 1937056144 = 12774^2 + 44012^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2100231220.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 859531 + ... + 861970.

It is an arithmetic number, because the mean of its divisors is an integer number (186782967).

Almost surely, 2^2100231220 is an apocalyptic number.

2100231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100231220 is an abundant number, since it is smaller than the sum of its proper divisors (2382559988).

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

2100231220 is a wasteful number, since it uses less digits than its factorization.

2100231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721571 (or 1721569 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2100231220 is about 45828.2796971477. The cubic root of 2100231220 is about 1280.6261625507.

Adding to 2100231220 its reverse (221320012), we get a palindrome (2321551232).

The spelling of 2100231220 in words is "two billion, one hundred million, two hundred thirty-one thousand, two hundred twenty".