10545030721 has 9 divisors (see below), whose sum is σ = 10924276233. Its totient is φ = 10178533680.

The previous prime is 10545030719. The next prime is 10545030781. The reversal of 10545030721 is 12703054501.

It is a happy number.

The square root of 10545030721 is 102689.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 34680321 + 10510350400 = 5889^2 + 102520^2 .

It is not a de Polignac number, because 10545030721 - 2¹ = 10545030719 is a prime.

It is a super-2 number, since 2×10545030721² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10545030721.

It is not an unprimeable number, because it can be changed into a prime (10545030781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2976211 + ... + 2979751.

Almost surely, 2^10545030721 is an apocalyptic number.

10545030721 is the 102689-th square number.

10545030721 is the 51345-th centered octagonal number.

It is an amenable number.

10545030721 is a deficient number, since it is larger than the sum of its proper divisors (379245512).

10545030721 is an frugal number, since it uses more digits than its factorization.

10545030721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140 (or 3570 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 10545030721 in words is "ten billion, five hundred forty-five million, thirty thousand, seven hundred twenty-one".