221331320232 has 32 divisors (see below), whose sum is σ = 603630874080. Its totient is φ = 67070096960.

The previous prime is 221331320209. The next prime is 221331320251. The reversal of 221331320232 is 232023133122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419187843 + ... + 419188370.

It is an arithmetic number, because the mean of its divisors is an integer number (18863464815).

Almost surely, 2^221331320232 is an apocalyptic number.

221331320232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221331320232 is an abundant number, since it is smaller than the sum of its proper divisors (382299553848).

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

221331320232 is a wasteful number, since it uses less digits than its factorization.

221331320232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838376233 (or 838376229 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 221331320232 its reverse (232023133122), we get a palindrome (453354453354).

The spelling of 221331320232 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred twenty thousand, two hundred thirty-two".