221221202020229 has 2 divisors, whose sum is σ = 221221202020230. Its totient is φ = 221221202020228.

The previous prime is 221221202020171. The next prime is 221221202020241. The reversal of 221221202020229 is 922020202122122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134212920100900 + 87008281919329 = 11585030^2 + 9327823^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221202020229 - 2⁸ = 221221202019973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221202020279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610601010114 + 110610601010115.

It is an arithmetic number, because the mean of its divisors is an integer number (110610601010115).

Almost surely, 2^{221221202020229} is an apocalyptic number.

It is an amenable number.

221221202020229 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221202020229 is an equidigital number, since it uses as much as digits as its factorization.

221221202020229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 221221202020229 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, two hundred twenty-nine".