11278821 has 8 divisors (see below), whose sum is σ = 15445024. Its totient is φ = 7315920.

The previous prime is 11278811. The next prime is 11278829. The reversal of 11278821 is 12887211.

It is a happy number.

11278821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11278821 - 2⁵ = 11278789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11278829) 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, 50695 + ... + 50916.

It is an arithmetic number, because the mean of its divisors is an integer number (1930628).

Almost surely, 2^11278821 is an apocalyptic number.

It is an amenable number.

11278821 is a deficient number, since it is larger than the sum of its proper divisors (4166203).

11278821 is a wasteful number, since it uses less digits than its factorization.

11278821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101651.

The product of its digits is 1792, while the sum is 30.

The square root of 11278821 is about 3358.3955990919. The cubic root of 11278821 is about 224.2614201830.

The spelling of 11278821 in words is "eleven million, two hundred seventy-eight thousand, eight hundred twenty-one".