11863440221 has 2 divisors, whose sum is σ = 11863440222. Its totient is φ = 11863440220.

The previous prime is 11863440139. The next prime is 11863440223. The reversal of 11863440221 is 12204436811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10389724900 + 1473715321 = 101930^2 + 38389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11863440221 is a prime.

Together with 11863440223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11863440223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5931720110 + 5931720111.

It is an arithmetic number, because the mean of its divisors is an integer number (5931720111).

Almost surely, 2^11863440221 is an apocalyptic number.

It is an amenable number.

11863440221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11863440221 is an equidigital number, since it uses as much as digits as its factorization.

11863440221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 11863440221 in words is "eleven billion, eight hundred sixty-three million, four hundred forty thousand, two hundred twenty-one".