10539721 has 4 divisors (see below), whose sum is σ = 10879744. Its totient is φ = 10199700.

The previous prime is 10539719. The next prime is 10539733. The reversal of 10539721 is 12793501.

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 10539721 - 2¹ = 10539719 is a prime.

It is a super-2 number, since 2×10539721² = 222171437515682, which contains 22 as substring.

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 10539721.

It is not an unprimeable number, because it can be changed into a prime (10539751) 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, 169965 + ... + 170026.

It is an arithmetic number, because the mean of its divisors is an integer number (2719936).

Almost surely, 2^10539721 is an apocalyptic number.

It is an amenable number.

10539721 is a deficient number, since it is larger than the sum of its proper divisors (340023).

10539721 is an equidigital number, since it uses as much as digits as its factorization.

10539721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340022.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 10539721 is about 3246.4936469983. The cubic root of 10539721 is about 219.2517347408.

The spelling of 10539721 in words is "ten million, five hundred thirty-nine thousand, seven hundred twenty-one".