10812721 has 4 divisors (see below), whose sum is σ = 10843200. Its totient is φ = 10782244.

The previous prime is 10812713. The next prime is 10812727. The reversal of 10812721 is 12721801.

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 10812721 - 2³ = 10812713 is a prime.

It is a super-4 number, since 4×10812721⁴ (a number of 29 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10812692 and 10812701.

It is not an unprimeable number, because it can be changed into a prime (10812727) 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 3 ways as a sum of consecutive naturals, for example, 14701 + ... + 15418.

It is an arithmetic number, because the mean of its divisors is an integer number (2710800).

Almost surely, 2^10812721 is an apocalyptic number.

It is an amenable number.

10812721 is a deficient number, since it is larger than the sum of its proper divisors (30479).

10812721 is an equidigital number, since it uses as much as digits as its factorization.

10812721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30478.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 10812721 is about 3288.2702139575. The cubic root of 10812721 is about 221.1286420973.

The spelling of 10812721 in words is "ten million, eight hundred twelve thousand, seven hundred twenty-one".