221191353841 has 2 divisors, whose sum is σ = 221191353842. Its totient is φ = 221191353840.

The previous prime is 221191353767. The next prime is 221191353869. The reversal of 221191353841 is 148353191122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197291430625 + 23899923216 = 444175^2 + 154596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221191353841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221191353794 and 221191353803.

It is not a weakly prime, because it can be changed into another prime (221191353881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110595676920 + 110595676921.

It is an arithmetic number, because the mean of its divisors is an integer number (110595676921).

Almost surely, 2^221191353841 is an apocalyptic number.

It is an amenable number.

221191353841 is a deficient number, since it is larger than the sum of its proper divisors (1).

221191353841 is an equidigital number, since it uses as much as digits as its factorization.

221191353841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The spelling of 221191353841 in words is "two hundred twenty-one billion, one hundred ninety-one million, three hundred fifty-three thousand, eight hundred forty-one".