2258172721 has 16 divisors (see below), whose sum is σ = 2609511424. Its totient is φ = 1914074064.

The previous prime is 2258172607. The next prime is 2258172731. The reversal of 2258172721 is 1272718522.

2258172721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2258172721 - 2¹⁷ = 2258041649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2258172731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634870 + ... + 638416.

It is an arithmetic number, because the mean of its divisors is an integer number (163094464).

Almost surely, 2^2258172721 is an apocalyptic number.

It is an amenable number.

2258172721 is a deficient number, since it is larger than the sum of its proper divisors (351338703).

2258172721 is a wasteful number, since it uses less digits than its factorization.

2258172721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its digits is 31360, while the sum is 37.

The square root of 2258172721 is about 47520.2348584264. The cubic root of 2258172721 is about 1311.9553420952.

The spelling of 2258172721 in words is "two billion, two hundred fifty-eight million, one hundred seventy-two thousand, seven hundred twenty-one".