2102021221221 has 32 divisors (see below), whose sum is σ = 3234086789120. Its totient is φ = 1348328730672.

The previous prime is 2102021221187. The next prime is 2102021221259. The reversal of 2102021221221 is 1221221202012.

It is a happy number.

2102021221221 is a `hidden beast` number, since 21 + 0 + 202 + 1 + 221 + 221 = 666.

It is not a de Polignac number, because 2102021221221 - 2¹⁰ = 2102021220197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102021221194 and 2102021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021221271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13433605 + ... + 13589178.

It is an arithmetic number, because the mean of its divisors is an integer number (101065212160).

Almost surely, 2^{2102021221221} is an apocalyptic number.

It is an amenable number.

2102021221221 is a deficient number, since it is larger than the sum of its proper divisors (1132065567899).

2102021221221 is a wasteful number, since it uses less digits than its factorization.

2102021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27022902 (or 27022896 counting only the distinct ones).

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

Adding to 2102021221221 its reverse (1221221202012), we get a palindrome (3323242423233).

The spelling of 2102021221221 in words is "two trillion, one hundred two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".