2100100221 has 24 divisors (see below), whose sum is σ = 3191292000. Its totient is φ = 1328867232.

The previous prime is 2100100217. The next prime is 2100100231. The reversal of 2100100221 is 1220010012.

It is not a de Polignac number, because 2100100221 - 2² = 2100100217 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100100231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52791 + ... + 83588.

It is an arithmetic number, because the mean of its divisors is an integer number (132970500).

Almost surely, 2^2100100221 is an apocalyptic number.

It is an amenable number.

2100100221 is a deficient number, since it is larger than the sum of its proper divisors (1091191779).

2100100221 is a wasteful number, since it uses less digits than its factorization.

2100100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136473 (or 136470 counting only the distinct ones).

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

The square root of 2100100221 is about 45826.8504372709. The cubic root of 2100100221 is about 1280.5995362387.

Adding to 2100100221 its reverse (1220010012), we get a palindrome (3320110233).

The spelling of 2100100221 in words is "two billion, one hundred million, one hundred thousand, two hundred twenty-one".