2265115821 has 4 divisors (see below), whose sum is σ = 3020154432. Its totient is φ = 1510077212.

The previous prime is 2265115813. The next prime is 2265115829. The reversal of 2265115821 is 1285115622.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2265115813) and next prime (2265115829).

It is a cyclic number.

It is not a de Polignac number, because 2265115821 - 2³ = 2265115813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2265115829) 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, 377519301 + ... + 377519306.

It is an arithmetic number, because the mean of its divisors is an integer number (755038608).

Almost surely, 2^2265115821 is an apocalyptic number.

It is an amenable number.

2265115821 is a deficient number, since it is larger than the sum of its proper divisors (755038611).

2265115821 is an equidigital number, since it uses as much as digits as its factorization.

2265115821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755038610.

The product of its digits is 9600, while the sum is 33.

The square root of 2265115821 is about 47593.2329328446. The cubic root of 2265115821 is about 1313.2985693356.

The spelling of 2265115821 in words is "two billion, two hundred sixty-five million, one hundred fifteen thousand, eight hundred twenty-one".