11199623221 has 2 divisors, whose sum is σ = 11199623222. Its totient is φ = 11199623220.

The previous prime is 11199623219. The next prime is 11199623287. The reversal of 11199623221 is 12232699111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6617822500 + 4581800721 = 81350^2 + 67689^2 .

It is a cyclic number.

It is not a de Polignac number, because 11199623221 - 2¹ = 11199623219 is a prime.

Together with 11199623219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11199623621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5599811610 + 5599811611.

It is an arithmetic number, because the mean of its divisors is an integer number (5599811611).

Almost surely, 2^11199623221 is an apocalyptic number.

It is an amenable number.

11199623221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11199623221 is an equidigital number, since it uses as much as digits as its factorization.

11199623221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The spelling of 11199623221 in words is "eleven billion, one hundred ninety-nine million, six hundred twenty-three thousand, two hundred twenty-one".