221220506069 has 2 divisors, whose sum is σ = 221220506070. Its totient is φ = 221220506068.

The previous prime is 221220506047. The next prime is 221220506093. The reversal of 221220506069 is 960605022122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150902725444 + 70317780625 = 388462^2 + 265175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220506069 is a prime.

It is a super-2 number, since 2×221220506069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220505069) 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, 110610253034 + 110610253035.

It is an arithmetic number, because the mean of its divisors is an integer number (110610253035).

Almost surely, 2^221220506069 is an apocalyptic number.

It is an amenable number.

221220506069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220506069 is an equidigital number, since it uses as much as digits as its factorization.

221220506069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 221220506069 in words is "two hundred twenty-one billion, two hundred twenty million, five hundred six thousand, sixty-nine".