2101221022221 has 8 divisors (see below), whose sum is σ = 3112920032960. Its totient is φ = 1400814014796.

The previous prime is 2101221022189. The next prime is 2101221022253. The reversal of 2101221022221 is 1222201221012.

It is a happy number.

2101221022221 is a `hidden beast` number, since 210 + 1 + 2 + 210 + 22 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (2101221022189) and next prime (2101221022253).

It is not a de Polignac number, because 2101221022221 - 2⁵ = 2101221022189 is a prime.

It is a super-3 number, since 3×2101221022221³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101221022194 and 2101221022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101221027221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38911500385 + ... + 38911500438.

It is an arithmetic number, because the mean of its divisors is an integer number (389115004120).

Almost surely, 2^{2101221022221} is an apocalyptic number.

It is an amenable number.

2101221022221 is a deficient number, since it is larger than the sum of its proper divisors (1011699010739).

2101221022221 is an equidigital number, since it uses as much as digits as its factorization.

2101221022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77823000832 (or 77823000826 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2101221022221 its reverse (1222201221012), we get a palindrome (3323422243233).

The spelling of 2101221022221 in words is "two trillion, one hundred one billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".