11172921 has 4 divisors (see below), whose sum is σ = 14897232. Its totient is φ = 7448612.

The previous prime is 11172911. The next prime is 11172929. The reversal of 11172921 is 12927111.

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 11172921 - 2⁶ = 11172857 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11172891 and 11172900.

It is not an unprimeable number, because it can be changed into a prime (11172929) 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, 1862151 + ... + 1862156.

It is an arithmetic number, because the mean of its divisors is an integer number (3724308).

Almost surely, 2^11172921 is an apocalyptic number.

It is an amenable number.

11172921 is a deficient number, since it is larger than the sum of its proper divisors (3724311).

11172921 is an equidigital number, since it uses as much as digits as its factorization.

11172921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724310.

The product of its digits is 252, while the sum is 24.

The square root of 11172921 is about 3342.5919583461. The cubic root of 11172921 is about 223.5573275561.

The spelling of 11172921 in words is "eleven million, one hundred seventy-two thousand, nine hundred twenty-one".