221413656 has 64 divisors (see below), whose sum is σ = 575769600. Its totient is φ = 70876800.

The previous prime is 221413639. The next prime is 221413657. The reversal of 221413656 is 656314122.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221413657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102346 + ... + 104486.

It is an arithmetic number, because the mean of its divisors is an integer number (8996400).

Almost surely, 2^221413656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221413656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287884800).

221413656 is an abundant number, since it is smaller than the sum of its proper divisors (354355944).

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

221413656 is a wasteful number, since it uses less digits than its factorization.

221413656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2316 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 221413656 is about 14879.9749999790. The cubic root of 221413656 is about 604.9713403085.

Adding to 221413656 its reverse (656314122), we get a palindrome (877727778).

The spelling of 221413656 in words is "two hundred twenty-one million, four hundred thirteen thousand, six hundred fifty-six".