221456436361 has 4 divisors (see below), whose sum is σ = 221532567300. Its totient is φ = 221380305424.

The previous prime is 221456436329. The next prime is 221456436371. The reversal of 221456436361 is 163634654122.

It is a happy number.

221456436361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163634654122 = 2 ⋅81817327061.

It can be written as a sum of positive squares in 2 ways, for example, as 206893980736 + 14562455625 = 454856^2 + 120675^2 .

It is a cyclic number.

It is not a de Polignac number, because 221456436361 - 2⁵ = 221456436329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221456436301) 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, 38061106 + ... + 38066923.

It is an arithmetic number, because the mean of its divisors is an integer number (55383141825).

Almost surely, 2^221456436361 is an apocalyptic number.

It is an amenable number.

221456436361 is a deficient number, since it is larger than the sum of its proper divisors (76130939).

221456436361 is an equidigital number, since it uses as much as digits as its factorization.

221456436361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76130938.

The product of its digits is 622080, while the sum is 43.

The spelling of 221456436361 in words is "two hundred twenty-one billion, four hundred fifty-six million, four hundred thirty-six thousand, three hundred sixty-one".