2255851721 has 4 divisors (see below), whose sum is σ = 2265967872. Its totient is φ = 2245735572.

The previous prime is 2255851709. The next prime is 2255851723. The reversal of 2255851721 is 1271585522.

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 2255851721 - 2¹⁰ = 2255850697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2255851723) 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, 5057741 + ... + 5058186.

It is an arithmetic number, because the mean of its divisors is an integer number (566491968).

Almost surely, 2^2255851721 is an apocalyptic number.

It is an amenable number.

2255851721 is a deficient number, since it is larger than the sum of its proper divisors (10116151).

2255851721 is a wasteful number, since it uses less digits than its factorization.

2255851721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10116150.

The product of its digits is 56000, while the sum is 38.

The square root of 2255851721 is about 47495.8074044436. The cubic root of 2255851721 is about 1311.5057024119.

The spelling of 2255851721 in words is "two billion, two hundred fifty-five million, eight hundred fifty-one thousand, seven hundred twenty-one".