221001321231012 has 48 divisors (see below), whose sum is σ = 595958619070080. Its totient is φ = 62433760088832.

The previous prime is 221001321230999. The next prime is 221001321231013. The reversal of 221001321231012 is 210132123100122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 221001321231012.

It is not an unprimeable number, because it can be changed into a prime (221001321231013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14780712243 + ... + 14780727194.

It is an arithmetic number, because the mean of its divisors is an integer number (12415804563960).

Almost surely, 2^{221001321231012} is an apocalyptic number.

It is an amenable number.

221001321231012 is an abundant number, since it is smaller than the sum of its proper divisors (374957297839068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221001321231012 is a wasteful number, since it uses less digits than its factorization.

221001321231012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29561439540 (or 29561439538 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 221001321231012 its reverse (210132123100122), we get a palindrome (431133444331134).

The spelling of 221001321231012 in words is "two hundred twenty-one trillion, one billion, three hundred twenty-one million, two hundred thirty-one thousand, twelve".