2115221100 has 36 divisors (see below), whose sum is σ = 6120040584. Its totient is φ = 564058880.

The previous prime is 2115221099. The next prime is 2115221131. The reversal of 2115221100 is 11225112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2115221100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3525069 + ... + 3525668.

Almost surely, 2^2115221100 is an apocalyptic number.

2115221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2115221100 is an abundant number, since it is smaller than the sum of its proper divisors (4004819484).

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

2115221100 is a wasteful number, since it uses less digits than its factorization.

2115221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050754 (or 7050747 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2115221100 is about 45991.5329163967. The cubic root of 2115221100 is about 1283.6656600788.

Adding to 2115221100 its reverse (11225112), we get a palindrome (2126446212).

The spelling of 2115221100 in words is "two billion, one hundred fifteen million, two hundred twenty-one thousand, one hundred".