221411110164509 has 2 divisors, whose sum is σ = 221411110164510. Its totient is φ = 221411110164508.

The previous prime is 221411110164481. The next prime is 221411110164511. The reversal of 221411110164509 is 905461011114122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178463468796484 + 42947641368025 = 13359022^2 + 6553445^2 .

It is a cyclic number.

It is not a de Polignac number, because 221411110164509 - 2³² = 221406815197213 is a prime.

It is a super-2 number, since 2×221411110164509² (a number of 29 digits) contains 22 as substring.

Together with 221411110164511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221411110164539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110705555082254 + 110705555082255.

It is an arithmetic number, because the mean of its divisors is an integer number (110705555082255).

Almost surely, 2^{221411110164509} is an apocalyptic number.

It is an amenable number.

221411110164509 is a deficient number, since it is larger than the sum of its proper divisors (1).

221411110164509 is an equidigital number, since it uses as much as digits as its factorization.

221411110164509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 221411110164509 in words is "two hundred twenty-one trillion, four hundred eleven billion, one hundred ten million, one hundred sixty-four thousand, five hundred nine".