221179368149 has 2 divisors, whose sum is σ = 221179368150. Its totient is φ = 221179368148.

The previous prime is 221179368131. The next prime is 221179368167. The reversal of 221179368149 is 941863971122.

It is a balanced prime because it is at equal distance from previous prime (221179368131) and next prime (221179368167).

It can be written as a sum of positive squares in only one way, i.e., 220893420049 + 285948100 = 469993^2 + 16910^2 .

It is a cyclic number.

It is not a de Polignac number, because 221179368149 - 2¹² = 221179364053 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221179368149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221179368119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110589684074 + 110589684075.

It is an arithmetic number, because the mean of its divisors is an integer number (110589684075).

Almost surely, 2^221179368149 is an apocalyptic number.

It is an amenable number.

221179368149 is a deficient number, since it is larger than the sum of its proper divisors (1).

221179368149 is an equidigital number, since it uses as much as digits as its factorization.

221179368149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The spelling of 221179368149 in words is "two hundred twenty-one billion, one hundred seventy-nine million, three hundred sixty-eight thousand, one hundred forty-nine".