2771148821 has 4 divisors (see below), whose sum is σ = 3167027232. Its totient is φ = 2375270412.

The previous prime is 2771148799. The next prime is 2771148827. The reversal of 2771148821 is 1288411772.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2771148821 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 (2771148827) 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, 197939195 + ... + 197939208.

It is an arithmetic number, because the mean of its divisors is an integer number (791756808).

Almost surely, 2^2771148821 is an apocalyptic number.

It is an amenable number.

2771148821 is a deficient number, since it is larger than the sum of its proper divisors (395878411).

2771148821 is an equidigital number, since it uses as much as digits as its factorization.

2771148821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395878410.

The product of its digits is 50176, while the sum is 41.

The square root of 2771148821 is about 52641.7022996027. The cubic root of 2771148821 is about 1404.6020024060.

The spelling of 2771148821 in words is "two billion, seven hundred seventy-one million, one hundred forty-eight thousand, eight hundred twenty-one".