10001200221 has 16 divisors (see below), whose sum is σ = 15596414400. Its totient is φ = 6316547184.

The previous prime is 10001200219. The next prime is 10001200267. The reversal of 10001200221 is 12200210001.

It is not a de Polignac number, because 10001200221 - 2¹ = 10001200219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001200721) 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, 9747246 + ... + 9748271.

It is an arithmetic number, because the mean of its divisors is an integer number (974775900).

Almost surely, 2^10001200221 is an apocalyptic number.

It is an amenable number.

10001200221 is a deficient number, since it is larger than the sum of its proper divisors (5595214179).

10001200221 is a wasteful number, since it uses less digits than its factorization.

10001200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19495545 (or 19495539 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10001200221 its reverse (12200210001), we get a palindrome (22201410222).

The spelling of 10001200221 in words is "ten billion, one million, two hundred thousand, two hundred twenty-one".