221212032361 has 2 divisors, whose sum is σ = 221212032362. Its totient is φ = 221212032360.

The previous prime is 221212032319. The next prime is 221212032401. The reversal of 221212032361 is 163230212122.

221212032361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212737725225 + 8474307136 = 461235^2 + 92056^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212032361 - 2¹³ = 221212024169 is a prime.

It is a super-2 number, since 2×221212032361² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221212012361) 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 as a sum of consecutive naturals, namely, 110606016180 + 110606016181.

It is an arithmetic number, because the mean of its divisors is an integer number (110606016181).

Almost surely, 2^221212032361 is an apocalyptic number.

It is an amenable number.

221212032361 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212032361 is an equidigital number, since it uses as much as digits as its factorization.

221212032361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 221212032361 its reverse (163230212122), we get a palindrome (384442244483).

The spelling of 221212032361 in words is "two hundred twenty-one billion, two hundred twelve million, thirty-two thousand, three hundred sixty-one".