11572921 has 4 divisors (see below), whose sum is σ = 11791332. Its totient is φ = 11354512.

The previous prime is 11572907. The next prime is 11572927. The reversal of 11572921 is 12927511.

11572921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12927511 = 397 ⋅32563.

It can be written as a sum of positive squares in 2 ways, for example, as 5812921 + 5760000 = 2411^2 + 2400^2 .

It is a cyclic number.

It is not a de Polignac number, because 11572921 - 2⁷ = 11572793 is a prime.

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 11572921.

It is not an unprimeable number, because it can be changed into a prime (11572927) 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, 109126 + ... + 109231.

It is an arithmetic number, because the mean of its divisors is an integer number (2947833).

Almost surely, 2^11572921 is an apocalyptic number.

It is an amenable number.

11572921 is a deficient number, since it is larger than the sum of its proper divisors (218411).

11572921 is an equidigital number, since it uses as much as digits as its factorization.

11572921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218410.

The product of its digits is 1260, while the sum is 28.

The square root of 11572921 is about 3401.8996163908. The cubic root of 11572921 is about 226.1939559811.

The spelling of 11572921 in words is "eleven million, five hundred seventy-two thousand, nine hundred twenty-one".