2245015728821 has 4 divisors (see below), whose sum is σ = 2245025026572. Its totient is φ = 2245006431072.

The previous prime is 2245015728817. The next prime is 2245015728847. The reversal of 2245015728821 is 1288275105422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1211509670596 + 1033506058225 = 1100686^2 + 1016615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2245015728821 - 2² = 2245015728817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2245015728721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4276760 + ... + 4772913.

It is an arithmetic number, because the mean of its divisors is an integer number (561256256643).

Almost surely, 2^{2245015728821} is an apocalyptic number.

It is an amenable number.

2245015728821 is a deficient number, since it is larger than the sum of its proper divisors (9297751).

2245015728821 is an equidigital number, since it uses as much as digits as its factorization.

2245015728821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9297750.

The product of its (nonzero) digits is 716800, while the sum is 47.

The spelling of 2245015728821 in words is "two trillion, two hundred forty-five billion, fifteen million, seven hundred twenty-eight thousand, eight hundred twenty-one".