221012326 has 4 divisors (see below), whose sum is σ = 331518492. Its totient is φ = 110506162.

The previous prime is 221012321. The next prime is 221012329. The reversal of 221012326 is 623210122.

It is a semiprime because it is the product of two primes.

It is a super-5 number, since 5×221012326⁵ (a number of 43 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55253080 + ... + 55253083.

It is an arithmetic number, because the mean of its divisors is an integer number (82879623).

Almost surely, 2^221012326 is an apocalyptic number.

221012326 is a deficient number, since it is larger than the sum of its proper divisors (110506166).

221012326 is a wasteful number, since it uses less digits than its factorization.

221012326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110506165.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 221012326 is about 14866.4833097811. The cubic root of 221012326 is about 604.6055995583.

Adding to 221012326 its reverse (623210122), we get a palindrome (844222448).

The spelling of 221012326 in words is "two hundred twenty-one million, twelve thousand, three hundred twenty-six".