11308921 has 8 divisors (see below), whose sum is σ = 12224520. Its totient is φ = 10399872.

The previous prime is 11308909. The next prime is 11308991. The reversal of 11308921 is 12980311.

It can be written as a sum of positive squares in 4 ways, for example, as 160000 + 11148921 = 400^2 + 3339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11308921 - 2⁵ = 11308889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11308991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325 + ... + 5293.

It is an arithmetic number, because the mean of its divisors is an integer number (1528065).

Almost surely, 2^11308921 is an apocalyptic number.

It is an amenable number.

11308921 is a deficient number, since it is larger than the sum of its proper divisors (915599).

11308921 is a wasteful number, since it uses less digits than its factorization.

11308921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3275.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 11308921 is about 3362.8739197300. The cubic root of 11308921 is about 224.4607398571.

The spelling of 11308921 in words is "eleven million, three hundred eight thousand, nine hundred twenty-one".