2258017821 has 6 divisors (see below), whose sum is σ = 3261581310. Its totient is φ = 1505345208.

The previous prime is 2258017819. The next prime is 2258017831. The reversal of 2258017821 is 1287108522.

2258017821 is a `hidden beast` number, since 2 + 2 + 580 + 1 + 78 + 2 + 1 = 666.

2258017821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1994604921 + 263412900 = 44661^2 + 16230^2 .

It is not a de Polignac number, because 2258017821 - 2¹ = 2258017819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2258017831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125445426 + ... + 125445443.

It is an arithmetic number, because the mean of its divisors is an integer number (543596885).

Almost surely, 2^2258017821 is an apocalyptic number.

It is an amenable number.

2258017821 is a deficient number, since it is larger than the sum of its proper divisors (1003563489).

2258017821 is a wasteful number, since it uses less digits than its factorization.

2258017821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250890875 (or 250890872 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 2258017821 is about 47518.6049984635. The cubic root of 2258017821 is about 1311.9253434260.

It can be divided in two parts, 22580 and 17821, that added together give a square (40401 = 201²).

The spelling of 2258017821 in words is "two billion, two hundred fifty-eight million, seventeen thousand, eight hundred twenty-one".