2828451221 has 4 divisors (see below), whose sum is σ = 2828867052. Its totient is φ = 2828035392.

The previous prime is 2828451179. The next prime is 2828451257. The reversal of 2828451221 is 1221548282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1969140625 + 859310596 = 44375^2 + 29314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2828451221 is a prime.

It is a super-3 number, since 3×2828451221³ (a number of 29 digits) contains 333 as substring.

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 (2828451271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197540 + ... + 211373.

It is an arithmetic number, because the mean of its divisors is an integer number (707216763).

Almost surely, 2^2828451221 is an apocalyptic number.

It is an amenable number.

2828451221 is a deficient number, since it is larger than the sum of its proper divisors (415831).

2828451221 is an equidigital number, since it uses as much as digits as its factorization.

2828451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415830.

The product of its digits is 20480, while the sum is 35.

The square root of 2828451221 is about 53183.1855100839. The cubic root of 2828451221 is about 1414.2175784040.

The spelling of 2828451221 in words is "two billion, eight hundred twenty-eight million, four hundred fifty-one thousand, two hundred twenty-one".