2102021201221 has 8 divisors (see below), whose sum is σ = 2112565027320. Its totient is φ = 2091497595072.

The previous prime is 2102021201179. The next prime is 2102021201227. The reversal of 2102021201221 is 1221021202012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19743341121 + 2082277860100 = 140511^2 + 1443010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2102021201221 - 2⁹ = 2102021200709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102021201195 and 2102021201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021201227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4846530 + ... + 5262403.

It is an arithmetic number, because the mean of its divisors is an integer number (264070628415).

Almost surely, 2^{2102021201221} is an apocalyptic number.

It is an amenable number.

2102021201221 is a deficient number, since it is larger than the sum of its proper divisors (10543826099).

2102021201221 is a wasteful number, since it uses less digits than its factorization.

2102021201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109975.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2102021201221 its reverse (1221021202012), we get a palindrome (3323042403233).

The spelling of 2102021201221 in words is "two trillion, one hundred two billion, twenty-one million, two hundred one thousand, two hundred twenty-one".