11920921 has 4 divisors (see below), whose sum is σ = 11927844. Its totient is φ = 11914000.

The previous prime is 11920913. The next prime is 11920949. The reversal of 11920921 is 12902911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12902911 = 7 ⋅1843273.

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 4840000 = 2661^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 11920921 - 2³ = 11920913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11920901) 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, 1371 + ... + 5071.

It is an arithmetic number, because the mean of its divisors is an integer number (2981961).

Almost surely, 2^11920921 is an apocalyptic number.

It is an amenable number.

11920921 is a deficient number, since it is larger than the sum of its proper divisors (6923).

11920921 is an equidigital number, since it uses as much as digits as its factorization.

11920921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6922.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 11920921 is about 3452.6686779939. The cubic root of 11920921 is about 228.4388349839.

The spelling of 11920921 in words is "eleven million, nine hundred twenty thousand, nine hundred twenty-one".