221211000000169 has 2 divisors, whose sum is σ = 221211000000170. Its totient is φ = 221211000000168.

The previous prime is 221211000000143. The next prime is 221211000000229. The reversal of 221211000000169 is 961000000112122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212202237868569 + 9008762131600 = 14567163^2 + 3001460^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211000000169 - 2²¹ = 221210997903017 is a prime.

It is a super-2 number, since 2×221211000000169² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221211000007169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605500000084 + 110605500000085.

It is an arithmetic number, because the mean of its divisors is an integer number (110605500000085).

Almost surely, 2^{221211000000169} is an apocalyptic number.

It is an amenable number.

221211000000169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211000000169 is an equidigital number, since it uses as much as digits as its factorization.

221211000000169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 221211000000169 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred sixty-nine", and thus it is an aban number.