221312023221 has 32 divisors (see below), whose sum is σ = 305074944000. Its totient is φ = 142601195520.

The previous prime is 221312023211. The next prime is 221312023243. The reversal of 221312023221 is 122320213122.

It is not a de Polignac number, because 221312023221 - 2¹⁴ = 221312006837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312023211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11403436 + ... + 11422826.

It is an arithmetic number, because the mean of its divisors is an integer number (9533592000).

Almost surely, 2^221312023221 is an apocalyptic number.

It is an amenable number.

221312023221 is a deficient number, since it is larger than the sum of its proper divisors (83762920779).

221312023221 is a wasteful number, since it uses less digits than its factorization.

221312023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20109.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221312023221 its reverse (122320213122), we get a palindrome (343632236343).

The spelling of 221312023221 in words is "two hundred twenty-one billion, three hundred twelve million, twenty-three thousand, two hundred twenty-one".