2115220445 has 32 divisors (see below), whose sum is σ = 2803508064. Its totient is φ = 1522483200.

The previous prime is 2115220441. The next prime is 2115220447. The reversal of 2115220445 is 5440225112.

It can be written as a sum of positive squares in 16 ways, for example, as 1925717689 + 189502756 = 43883^2 + 13766^2 .

It is not a de Polignac number, because 2115220445 - 2² = 2115220441 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 (2115220441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445685 + ... + 450405.

It is an arithmetic number, because the mean of its divisors is an integer number (87609627).

Almost surely, 2^2115220445 is an apocalyptic number.

It is an amenable number.

2115220445 is a deficient number, since it is larger than the sum of its proper divisors (688287619).

2115220445 is a wasteful number, since it uses less digits than its factorization.

2115220445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4913.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2115220445 is about 45991.5257955202. The cubic root of 2115220445 is about 1283.6655275787.

Adding to 2115220445 its reverse (5440225112), we get a palindrome (7555445557).

The spelling of 2115220445 in words is "two billion, one hundred fifteen million, two hundred twenty thousand, four hundred forty-five".