221269231 has 4 divisors (see below), whose sum is σ = 232915000. Its totient is φ = 209623464.

The previous prime is 221269211. The next prime is 221269241. The reversal of 221269231 is 132962122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132962122 = 2 ⋅66481061.

It is a cyclic number.

It is not a de Polignac number, because 221269231 - 2⁵ = 221269199 is a prime.

It is a super-3 number, since 3×221269231³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221269231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221269211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5822856 + ... + 5822893.

It is an arithmetic number, because the mean of its divisors is an integer number (58228750).

Almost surely, 2^221269231 is an apocalyptic number.

221269231 is a deficient number, since it is larger than the sum of its proper divisors (11645769).

221269231 is a wasteful number, since it uses less digits than its factorization.

221269231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11645768.

The product of its digits is 2592, while the sum is 28.

The square root of 221269231 is about 14875.1212095902. The cubic root of 221269231 is about 604.8397736116.

The spelling of 221269231 in words is "two hundred twenty-one million, two hundred sixty-nine thousand, two hundred thirty-one".