221320453121 has 2 divisors, whose sum is σ = 221320453122. Its totient is φ = 221320453120.

The previous prime is 221320453103. The next prime is 221320453141. The reversal of 221320453121 is 121354023122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180642000400 + 40678452721 = 425020^2 + 201689^2 .

It is a cyclic number.

It is not a de Polignac number, because 221320453121 - 2³⁰ = 220246711297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221320453141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660226560 + 110660226561.

It is an arithmetic number, because the mean of its divisors is an integer number (110660226561).

Almost surely, 2^221320453121 is an apocalyptic number.

It is an amenable number.

221320453121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320453121 is an equidigital number, since it uses as much as digits as its factorization.

221320453121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 221320453121 its reverse (121354023122), we get a palindrome (342674476243).

The spelling of 221320453121 in words is "two hundred twenty-one billion, three hundred twenty million, four hundred fifty-three thousand, one hundred twenty-one".