11286721 has 16 divisors (see below), whose sum is σ = 12317184. Its totient is φ = 10314304.

The previous prime is 11286719. The next prime is 11286727. The reversal of 11286721 is 12768211.

It is not a de Polignac number, because 11286721 - 2¹ = 11286719 is a prime.

It is a super-3 number, since 3×11286721³ (a number of 22 digits) contains 333 as substring.

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 11286721.

It is not an unprimeable number, because it can be changed into a prime (11286727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57195 + ... + 57391.

It is an arithmetic number, because the mean of its divisors is an integer number (769824).

Almost surely, 2^11286721 is an apocalyptic number.

It is an amenable number.

11286721 is a deficient number, since it is larger than the sum of its proper divisors (1030463).

11286721 is a wasteful number, since it uses less digits than its factorization.

11286721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 1344, while the sum is 28.

The square root of 11286721 is about 3359.5715500641. The cubic root of 11286721 is about 224.3137676089.

The spelling of 11286721 in words is "eleven million, two hundred eighty-six thousand, seven hundred twenty-one".