12101021212221 has 32 divisors (see below), whose sum is σ = 18155220019200. Its totient is φ = 7964855524080.

The previous prime is 12101021212207. The next prime is 12101021212253. The reversal of 12101021212221 is 12221212010121.

12101021212221 is a `hidden beast` number, since 1 + 210 + 1 + 0 + 21 + 212 + 221 = 666.

It is not a de Polignac number, because 12101021212221 - 2²¹ = 12101019115069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101021212194 and 12101021212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101021212201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49728970 + ... + 49971716.

It is an arithmetic number, because the mean of its divisors is an integer number (567350625600).

Almost surely, 2^{12101021212221} is an apocalyptic number.

It is an amenable number.

12101021212221 is a deficient number, since it is larger than the sum of its proper divisors (6054198806979).

12101021212221 is a wasteful number, since it uses less digits than its factorization.

12101021212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266206 (or 266200 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12101021212221 its reverse (12221212010121), we get a palindrome (24322233222342).

The spelling of 12101021212221 in words is "twelve trillion, one hundred one billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".