221330121010321 has 4 divisors (see below), whose sum is σ = 221331557617444. Its totient is φ = 221328684403200.

The previous prime is 221330121010319. The next prime is 221330121010333. The reversal of 221330121010321 is 123010121033122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113867872050321 + 107462248960000 = 10670889^2 + 10366400^2 .

It is a cyclic number.

It is not a de Polignac number, because 221330121010321 - 2¹ = 221330121010319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221330121010292 and 221330121010301.

It is not an unprimeable number, because it can be changed into a prime (221330121010121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718072440 + ... + 718380601.

It is an arithmetic number, because the mean of its divisors is an integer number (55332889404361).

Almost surely, 2^{221330121010321} is an apocalyptic number.

It is an amenable number.

221330121010321 is a deficient number, since it is larger than the sum of its proper divisors (1436607123).

221330121010321 is a wasteful number, since it uses less digits than its factorization.

221330121010321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436607122.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 221330121010321 its reverse (123010121033122), we get a palindrome (344340242043443).

The spelling of 221330121010321 in words is "two hundred twenty-one trillion, three hundred thirty billion, one hundred twenty-one million, ten thousand, three hundred twenty-one".