221321032123220 has 12 divisors (see below), whose sum is σ = 464774167458804. Its totient is φ = 88528412849280.

The previous prime is 221321032123183. The next prime is 221321032123229. The reversal of 221321032123220 is 22321230123122.

It can be written as a sum of positive squares in 2 ways, for example, as 138487989320464 + 82833042802756 = 11768092^2 + 9101266^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221321032123220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321032123229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5533025803061 + ... + 5533025803100.

It is an arithmetic number, because the mean of its divisors is an integer number (38731180621567).

Almost surely, 2^{221321032123220} is an apocalyptic number.

221321032123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221321032123220 is an abundant number, since it is smaller than the sum of its proper divisors (243453135335584).

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

221321032123220 is a wasteful number, since it uses less digits than its factorization.

221321032123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066051606170 (or 11066051606168 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 221321032123220 its reverse (22321230123122), we get a palindrome (243642262246342).

The spelling of 221321032123220 in words is "two hundred twenty-one trillion, three hundred twenty-one billion, thirty-two million, one hundred twenty-three thousand, two hundred twenty".