2115651100 has 18 divisors (see below), whose sum is σ = 4590963104. Its totient is φ = 846260400.

The previous prime is 2115651089. The next prime is 2115651101. The reversal of 2115651100 is 11565112.

It is a happy number.

It is a super-3 number, since 3×2115651100³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115651101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10578156 + ... + 10578355.

Almost surely, 2^2115651100 is an apocalyptic number.

2115651100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2115651100 is an abundant number, since it is smaller than the sum of its proper divisors (2475312004).

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

2115651100 is a wasteful number, since it uses less digits than its factorization.

2115651100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21156525 (or 21156518 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 2115651100 is about 45996.2074523542. The cubic root of 2115651100 is about 1283.7526389821.

The spelling of 2115651100 in words is "two billion, one hundred fifteen million, six hundred fifty-one thousand, one hundred".