11447921 has 4 divisors (see below), whose sum is σ = 11459700. Its totient is φ = 11436144.

The previous prime is 11447879. The next prime is 11447923. The reversal of 11447921 is 12974411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 2686321 = 2960^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 11447921 - 2¹⁸ = 11185777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11447923) 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, 4286 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (2864925).

Almost surely, 2^11447921 is an apocalyptic number.

It is an amenable number.

11447921 is a deficient number, since it is larger than the sum of its proper divisors (11779).

11447921 is a wasteful number, since it uses less digits than its factorization.

11447921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11778.

The product of its digits is 2016, while the sum is 29.

The square root of 11447921 is about 3383.4776488105. The cubic root of 11447921 is about 225.3766268269.

The spelling of 11447921 in words is "eleven million, four hundred forty-seven thousand, nine hundred twenty-one".