221322130023221 has 4 divisors (see below), whose sum is σ = 221455697997132. Its totient is φ = 221188562049312.

The previous prime is 221322130023179. The next prime is 221322130023251. The reversal of 221322130023221 is 122320031223122.

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 172423423620100 + 48898706403121 = 13131010^2 + 6992761^2 .

It is a cyclic number.

It is not a de Polignac number, because 221322130023221 - 2⁶ = 221322130023157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221322130023251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66783984470 + ... + 66783987783.

It is an arithmetic number, because the mean of its divisors is an integer number (55363924499283).

Almost surely, 2^{221322130023221} is an apocalyptic number.

It is an amenable number.

221322130023221 is a deficient number, since it is larger than the sum of its proper divisors (133567973911).

221322130023221 is a wasteful number, since it uses less digits than its factorization.

221322130023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133567973910.

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

Adding to 221322130023221 its reverse (122320031223122), we get a palindrome (343642161246343).

The spelling of 221322130023221 in words is "two hundred twenty-one trillion, three hundred twenty-two billion, one hundred thirty million, twenty-three thousand, two hundred twenty-one".