2288972821 has 4 divisors (see below), whose sum is σ = 2290699072. Its totient is φ = 2287246572.

The previous prime is 2288972809. The next prime is 2288972827. The reversal of 2288972821 is 1282798822.

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 2288972821 - 2⁵ = 2288972789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2288972827) 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, 861135 + ... + 863788.

It is an arithmetic number, because the mean of its divisors is an integer number (572674768).

Almost surely, 2^2288972821 is an apocalyptic number.

It is an amenable number.

2288972821 is a deficient number, since it is larger than the sum of its proper divisors (1726251).

2288972821 is a wasteful number, since it uses less digits than its factorization.

2288972821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726250.

The product of its digits is 516096, while the sum is 49.

The square root of 2288972821 is about 47843.2108140748. The cubic root of 2288972821 is about 1317.8931843453.

The spelling of 2288972821 in words is "two billion, two hundred eighty-eight million, nine hundred seventy-two thousand, eight hundred twenty-one".