2276209721 has 4 divisors (see below), whose sum is σ = 2276330532. Its totient is φ = 2276088912.

The previous prime is 2276209711. The next prime is 2276209723. The reversal of 2276209721 is 1279026722.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1700737600 + 575472121 = 41240^2 + 23989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2276209721 is a prime.

It is a super-2 number, since 2×2276209721² = 10362261387949795682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2276209723) 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, 25370 + ... + 72083.

It is an arithmetic number, because the mean of its divisors is an integer number (569082633).

Almost surely, 2^2276209721 is an apocalyptic number.

It is an amenable number.

2276209721 is a deficient number, since it is larger than the sum of its proper divisors (120811).

2276209721 is an equidigital number, since it uses as much as digits as its factorization.

2276209721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120810.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 2276209721 is about 47709.6397072961. The cubic root of 2276209721 is about 1315.4391341336.

The spelling of 2276209721 in words is "two billion, two hundred seventy-six million, two hundred nine thousand, seven hundred twenty-one".