221332021321 has 4 divisors (see below), whose sum is σ = 226041213312. Its totient is φ = 216622829332.

The previous prime is 221332021319. The next prime is 221332021331. The reversal of 221332021321 is 123120233122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221332021321 - 2¹ = 221332021319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221332021292 and 221332021301.

It is not an unprimeable number, because it can be changed into a prime (221332021301) 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, 2354595925 + ... + 2354596018.

It is an arithmetic number, because the mean of its divisors is an integer number (56510303328).

Almost surely, 2^221332021321 is an apocalyptic number.

It is an amenable number.

221332021321 is a deficient number, since it is larger than the sum of its proper divisors (4709191991).

221332021321 is an equidigital number, since it uses as much as digits as its factorization.

221332021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4709191990.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221332021321 its reverse (123120233122), we get a palindrome (344452254443).

The spelling of 221332021321 in words is "two hundred twenty-one billion, three hundred thirty-two million, twenty-one thousand, three hundred twenty-one".