221012031321 has 24 divisors (see below), whose sum is σ = 323412545664. Its totient is φ = 145425546720.

The previous prime is 221012031313. The next prime is 221012031323. The reversal of 221012031321 is 123130210122.

221012031321 is a `hidden beast` number, since 2 + 210 + 120 + 313 + 21 = 666.

It is not a de Polignac number, because 221012031321 - 2³ = 221012031313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221012031294 and 221012031303.

It is not an unprimeable number, because it can be changed into a prime (221012031323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162466 + ... + 684411.

It is an arithmetic number, because the mean of its divisors is an integer number (13475522736).

Almost surely, 2^221012031321 is an apocalyptic number.

It is an amenable number.

221012031321 is a deficient number, since it is larger than the sum of its proper divisors (102400514343).

221012031321 is a wasteful number, since it uses less digits than its factorization.

221012031321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847261 (or 847258 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221012031321 its reverse (123130210122), we get a palindrome (344142241443).

The spelling of 221012031321 in words is "two hundred twenty-one billion, twelve million, thirty-one thousand, three hundred twenty-one".