2101221100221 has 4 divisors (see below), whose sum is σ = 2801628133632. Its totient is φ = 1400814066812.

The previous prime is 2101221100169. The next prime is 2101221100229. The reversal of 2101221100221 is 1220011221012.

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 a cyclic number.

It is not a de Polignac number, because 2101221100221 - 2⁶ = 2101221100157 is a prime.

It is a super-2 number, since 2×2101221100221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2101221100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101221100229) 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, 350203516701 + ... + 350203516706.

It is an arithmetic number, because the mean of its divisors is an integer number (700407033408).

Almost surely, 2^{2101221100221} is an apocalyptic number.

It is an amenable number.

2101221100221 is a deficient number, since it is larger than the sum of its proper divisors (700407033411).

2101221100221 is an equidigital number, since it uses as much as digits as its factorization.

2101221100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700407033410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2101221100221 its reverse (1220011221012), we get a palindrome (3321232321233).

The spelling of 2101221100221 in words is "two trillion, one hundred one billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".