221644410006 has 32 divisors (see below), whose sum is σ = 443948400000. Its totient is φ = 73771626240.

The previous prime is 221644409999. The next prime is 221644410011. The reversal of 221644410006 is 600014446122.

It is a happy number.

It is a super-3 number, since 3×221644410006³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11823661 + ... + 11842391.

It is an arithmetic number, because the mean of its divisors is an integer number (13873387500).

Almost surely, 2^221644410006 is an apocalyptic number.

221644410006 is an abundant number, since it is smaller than the sum of its proper divisors (222303989994).

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

221644410006 is a wasteful number, since it uses less digits than its factorization.

221644410006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21564.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 221644410006 its reverse (600014446122), we get a palindrome (821658856128).

The spelling of 221644410006 in words is "two hundred twenty-one billion, six hundred forty-four million, four hundred ten thousand, six".