10001021200221 has 4 divisors (see below), whose sum is σ = 13334694933632. Its totient is φ = 6667347466812.

The previous prime is 10001021200199. The next prime is 10001021200253. The reversal of 10001021200221 is 12200212010001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 10001021200221 - 2²⁶ = 10000954091357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001021200197 and 10001021200206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001021200021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666836866701 + ... + 1666836866706.

It is an arithmetic number, because the mean of its divisors is an integer number (3333673733408).

Almost surely, 2^{10001021200221} is an apocalyptic number.

It is an amenable number.

10001021200221 is a deficient number, since it is larger than the sum of its proper divisors (3333673733411).

10001021200221 is an equidigital number, since it uses as much as digits as its factorization.

10001021200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333673733410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10001021200221 its reverse (12200212010001), we get a palindrome (22201233210222).

The spelling of 10001021200221 in words is "ten trillion, one billion, twenty-one million, two hundred thousand, two hundred twenty-one".