10001321020221 has 16 divisors (see below), whose sum is σ = 13534758039744. Its totient is φ = 6567724969344.

The previous prime is 10001321020219. The next prime is 10001321020237. The reversal of 10001321020221 is 12202012310001.

It is not a de Polignac number, because 10001321020221 - 2¹ = 10001321020219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10001321020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001321020121) 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, 3193105 + ... + 5495321.

It is an arithmetic number, because the mean of its divisors is an integer number (845922377484).

Almost surely, 2^{10001321020221} is an apocalyptic number.

It is an amenable number.

10001321020221 is a deficient number, since it is larger than the sum of its proper divisors (3533437019523).

10001321020221 is a wasteful number, since it uses less digits than its factorization.

10001321020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323900.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 10001321020221 its reverse (12202012310001), we get a palindrome (22203333330222).

The spelling of 10001321020221 in words is "ten trillion, one billion, three hundred twenty-one million, twenty thousand, two hundred twenty-one".