11778221 has 16 divisors (see below), whose sum is σ = 14577024. Its totient is φ = 9267264.

The previous prime is 11778199. The next prime is 11778223. The reversal of 11778221 is 12287711.

It is a cyclic number.

It is not a de Polignac number, because 11778221 - 2¹⁰ = 11777197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778223) 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, 31391 + ... + 31763.

It is an arithmetic number, because the mean of its divisors is an integer number (911064).

Almost surely, 2^11778221 is an apocalyptic number.

It is an amenable number.

11778221 is a deficient number, since it is larger than the sum of its proper divisors (2798803).

11778221 is a wasteful number, since it uses less digits than its factorization.

11778221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 1568, while the sum is 29.

The square root of 11778221 is about 3431.9412873766. The cubic root of 11778221 is about 227.5236605428.

The spelling of 11778221 in words is "eleven million, seven hundred seventy-eight thousand, two hundred twenty-one".