11778284221 has 4 divisors (see below), whose sum is σ = 12849037344. Its totient is φ = 10707531100.

The previous prime is 11778284209. The next prime is 11778284227. The reversal of 11778284221 is 12248287711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11778284221 - 2⁷ = 11778284093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778284227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535376545 + ... + 535376566.

It is an arithmetic number, because the mean of its divisors is an integer number (3212259336).

Almost surely, 2^11778284221 is an apocalyptic number.

11778284221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11778284221 is a deficient number, since it is larger than the sum of its proper divisors (1070753123).

11778284221 is a wasteful number, since it uses less digits than its factorization.

11778284221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070753122.

The product of its digits is 100352, while the sum is 43.

The spelling of 11778284221 in words is "eleven billion, seven hundred seventy-eight million, two hundred eighty-four thousand, two hundred twenty-one".