221012221221061 has 2 divisors, whose sum is σ = 221012221221062. Its totient is φ = 221012221221060.

The previous prime is 221012221220993. The next prime is 221012221221091. The reversal of 221012221221061 is 160122122210122.

221012221221061 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., 196140865300900 + 24871355920161 = 14005030^2 + 4987119^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012221221061 - 2²⁷ = 221012087003333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012221221091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506110610530 + 110506110610531.

It is an arithmetic number, because the mean of its divisors is an integer number (110506110610531).

Almost surely, 2^{221012221221061} is an apocalyptic number.

It is an amenable number.

221012221221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012221221061 is an equidigital number, since it uses as much as digits as its factorization.

221012221221061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 221012221221061 its reverse (160122122210122), we get a palindrome (381134343431183).

The spelling of 221012221221061 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, sixty-one".