221226464 has 24 divisors (see below), whose sum is σ = 436630320. Its totient is φ = 110336256.

The previous prime is 221226463. The next prime is 221226521. The reversal of 221226464 is 464622122.

It is a super-2 number, since 2×221226464² = 97882296747886592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221226463) 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, 4637 + ... + 21539.

It is an arithmetic number, because the mean of its divisors is an integer number (18192930).

Almost surely, 2^221226464 is an apocalyptic number.

It is an amenable number.

221226464 is a deficient number, since it is larger than the sum of its proper divisors (215403856).

221226464 is a wasteful number, since it uses less digits than its factorization.

221226464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17322 (or 17314 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 221226464 is about 14873.6836056170. The cubic root of 221226464 is about 604.8008032146.

Adding to 221226464 its reverse (464622122), we get a palindrome (685848586).

The spelling of 221226464 in words is "two hundred twenty-one million, two hundred twenty-six thousand, four hundred sixty-four".