2100221100 has 54 divisors (see below), whose sum is σ = 6583029180. Its totient is φ = 560058720.

The previous prime is 2100221087. The next prime is 2100221113. The reversal of 2100221100 is 11220012.

It is an interprime number because it is at equal distance from previous prime (2100221087) and next prime (2100221113).

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1165890 + ... + 1167689.

Almost surely, 2^2100221100 is an apocalyptic number.

2100221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100221100 is an abundant number, since it is smaller than the sum of its proper divisors (4482808080).

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

2100221100 is a wasteful number, since it uses less digits than its factorization.

2100221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333599 (or 2333589 counting only the distinct ones).

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

The square root of 2100221100 is about 45828.1692848405. The cubic root of 2100221100 is about 1280.6241056410.

Adding to 2100221100 its reverse (11220012), we get a palindrome (2111441112).

The spelling of 2100221100 in words is "two billion, one hundred million, two hundred twenty-one thousand, one hundred".