2821223281 has 4 divisors (see below), whose sum is σ = 2821344112. Its totient is φ = 2821102452.

The previous prime is 2821223261. The next prime is 2821223329. The reversal of 2821223281 is 1823221282.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2821223281 - 2¹¹ = 2821221233 is a prime.

It is a super-2 number, since 2×2821223281² = 15918601602512809922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2821223261) 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, 12975 + ... + 76228.

It is an arithmetic number, because the mean of its divisors is an integer number (705336028).

Almost surely, 2^2821223281 is an apocalyptic number.

It is an amenable number.

2821223281 is a deficient number, since it is larger than the sum of its proper divisors (120831).

2821223281 is an equidigital number, since it uses as much as digits as its factorization.

2821223281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120830.

The product of its digits is 6144, while the sum is 31.

The square root of 2821223281 is about 53115.1887975558. The cubic root of 2821223281 is about 1413.0119009827.

The spelling of 2821223281 in words is "two billion, eight hundred twenty-one million, two hundred twenty-three thousand, two hundred eighty-one".