221346672 has 40 divisors (see below), whose sum is σ = 575617920. Its totient is φ = 73291200.

The previous prime is 221346667. The next prime is 221346679. The reversal of 221346672 is 276643122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221346679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8022 + ... + 22517.

It is an arithmetic number, because the mean of its divisors is an integer number (14390448).

Almost surely, 2^221346672 is an apocalyptic number.

It is an amenable number.

221346672 is an abundant number, since it is smaller than the sum of its proper divisors (354271248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221346672 is a wasteful number, since it uses less digits than its factorization.

221346672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30701 (or 30695 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 221346672 is about 14877.7240194863. The cubic root of 221346672 is about 604.9103270777.

Adding to 221346672 its reverse (276643122), we get a palindrome (497989794).

The spelling of 221346672 in words is "two hundred twenty-one million, three hundred forty-six thousand, six hundred seventy-two".