221271469 has 2 divisors, whose sum is σ = 221271470. Its totient is φ = 221271468.

The previous prime is 221271467. The next prime is 221271481. The reversal of 221271469 is 964172122.

221271469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143161225 + 78110244 = 11965^2 + 8838^2 .

It is a cyclic number.

It is not a de Polignac number, because 221271469 - 2¹ = 221271467 is a prime.

It is a super-2 number, since 2×221271469² = 97922125986835922, which contains 22 as substring.

Together with 221271467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221271467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110635734 + 110635735.

It is an arithmetic number, because the mean of its divisors is an integer number (110635735).

Almost surely, 2^221271469 is an apocalyptic number.

It is an amenable number.

221271469 is a deficient number, since it is larger than the sum of its proper divisors (1).

221271469 is an equidigital number, since it uses as much as digits as its factorization.

221271469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 221271469 is about 14875.1964356777. The cubic root of 221271469 is about 604.8418127968.

The spelling of 221271469 in words is "two hundred twenty-one million, two hundred seventy-one thousand, four hundred sixty-nine".