221226869 has 2 divisors, whose sum is σ = 221226870. Its totient is φ = 221226868.

The previous prime is 221226853. The next prime is 221226871. The reversal of 221226869 is 968622122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213598225 + 7628644 = 14615^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 221226869 - 2⁴ = 221226853 is a prime.

It is a super-2 number, since 2×221226869² = 97882655135086322, which contains 22 as substring.

Together with 221226871, 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 (221226839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110613434 + 110613435.

It is an arithmetic number, because the mean of its divisors is an integer number (110613435).

Almost surely, 2^221226869 is an apocalyptic number.

It is an amenable number.

221226869 is a deficient number, since it is larger than the sum of its proper divisors (1).

221226869 is an equidigital number, since it uses as much as digits as its factorization.

221226869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 221226869 is about 14873.6972202610. The cubic root of 221226869 is about 604.8011722846.

The spelling of 221226869 in words is "two hundred twenty-one million, two hundred twenty-six thousand, eight hundred sixty-nine".