221222221061 has 2 divisors, whose sum is σ = 221222221062. Its totient is φ = 221222221060.

The previous prime is 221222221027. The next prime is 221222221133. The reversal of 221222221061 is 160122222122.

221222221061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201595612036 + 19626609025 = 448994^2 + 140095^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222221061 - 2³⁰ = 220148479237 is a prime.

It is a super-3 number, since 3×221222221061³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222211061) 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, 110611110530 + 110611110531.

It is an arithmetic number, because the mean of its divisors is an integer number (110611110531).

Almost surely, 2^221222221061 is an apocalyptic number.

It is an amenable number.

221222221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222221061 is an equidigital number, since it uses as much as digits as its factorization.

221222221061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221222221061 its reverse (160122222122), we get a palindrome (381344443183).

The spelling of 221222221061 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, sixty-one".