2115500221 has 8 divisors (see below), whose sum is σ = 2163901824. Its totient is φ = 2067240000.

The previous prime is 2115500203. The next prime is 2115500243. The reversal of 2115500221 is 1220055112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115500221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115500251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4780 + ... + 65221.

It is an arithmetic number, because the mean of its divisors is an integer number (270487728).

Almost surely, 2^2115500221 is an apocalyptic number.

It is an amenable number.

2115500221 is a deficient number, since it is larger than the sum of its proper divisors (48401603).

2115500221 is an equidigital number, since it uses as much as digits as its factorization.

2115500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70691.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2115500221 is about 45994.5672987582. The cubic root of 2115500221 is about 1283.7221210454.

Adding to 2115500221 its reverse (1220055112), we get a palindrome (3335555333).

The spelling of 2115500221 in words is "two billion, one hundred fifteen million, five hundred thousand, two hundred twenty-one".