2855371721 has 4 divisors (see below), whose sum is σ = 2860372944. Its totient is φ = 2850370500.

The previous prime is 2855371709. The next prime is 2855371751. The reversal of 2855371721 is 1271735582.

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 not a de Polignac number, because 2855371721 - 2⁶ = 2855371657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2855371751) 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, 2499755 + ... + 2500896.

It is an arithmetic number, because the mean of its divisors is an integer number (715093236).

Almost surely, 2^2855371721 is an apocalyptic number.

It is an amenable number.

2855371721 is a deficient number, since it is larger than the sum of its proper divisors (5001223).

2855371721 is an equidigital number, since it uses as much as digits as its factorization.

2855371721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001222.

The product of its digits is 117600, while the sum is 41.

The square root of 2855371721 is about 53435.6783525764. The cubic root of 2855371721 is about 1418.6901432023.

The spelling of 2855371721 in words is "two billion, eight hundred fifty-five million, three hundred seventy-one thousand, seven hundred twenty-one".