221030321012 has 6 divisors (see below), whose sum is σ = 386803061778. Its totient is φ = 110515160504.

The previous prime is 221030320939. The next prime is 221030321027. The reversal of 221030321012 is 210123030122.

It can be written as a sum of positive squares in only one way, i.e., 221025977956 + 4343056 = 470134^2 + 2084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27628790123 + ... + 27628790130.

It is an arithmetic number, because the mean of its divisors is an integer number (64467176963).

Almost surely, 2^221030321012 is an apocalyptic number.

It is an amenable number.

221030321012 is a deficient number, since it is larger than the sum of its proper divisors (165772740766).

221030321012 is a wasteful number, since it uses less digits than its factorization.

221030321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55257580257 (or 55257580255 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221030321012 its reverse (210123030122), we get a palindrome (431153351134).

The spelling of 221030321012 in words is "two hundred twenty-one billion, thirty million, three hundred twenty-one thousand, twelve".