2749300021 has 8 divisors (see below), whose sum is σ = 3062881080. Its totient is φ = 2450304192.

The previous prime is 2749299997. The next prime is 2749300139. The reversal of 2749300021 is 1200039472.

It can be written as a sum of positive squares in 4 ways, for example, as 23415921 + 2725884100 = 4839^2 + 52210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2749300021 - 2¹¹ = 2749297973 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 (2749304021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3645910 + ... + 3646663.

It is an arithmetic number, because the mean of its divisors is an integer number (382860135).

Almost surely, 2^2749300021 is an apocalyptic number.

It is an amenable number.

2749300021 is a deficient number, since it is larger than the sum of its proper divisors (313581059).

2749300021 is a wasteful number, since it uses less digits than its factorization.

2749300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292615.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2749300021 is about 52433.7679458572. The cubic root of 2749300021 is about 1400.9007844109.

Adding to 2749300021 its reverse (1200039472), we get a palindrome (3949339493).

The spelling of 2749300021 in words is "two billion, seven hundred forty-nine million, three hundred thousand, twenty-one".