221221116132 has 24 divisors (see below), whose sum is σ = 516265646400. Its totient is φ = 73728508896.

The previous prime is 221221116113. The next prime is 221221116133. The reversal of 221221116132 is 231611122122.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221221116133) 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, 1405032 + ... + 1554527.

It is an arithmetic number, because the mean of its divisors is an integer number (21511068600).

Almost surely, 2^221221116132 is an apocalyptic number.

It is an amenable number.

221221116132 is an abundant number, since it is smaller than the sum of its proper divisors (295044530268).

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

221221116132 is a wasteful number, since it uses less digits than its factorization.

221221116132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965795 (or 2965793 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

Adding to 221221116132 its reverse (231611122122), we get a palindrome (452832238254).

The spelling of 221221116132 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred sixteen thousand, one hundred thirty-two".