1221021102121 has 8 divisors (see below), whose sum is σ = 1305397776384. Its totient is φ = 1138039083840.

The previous prime is 1221021102029. The next prime is 1221021102137. The reversal of 1221021102121 is 1212011201221.

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

It is not a de Polignac number, because 1221021102121 - 2¹¹ = 1221021100073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221021102095 and 1221021102104.

It is not an unprimeable number, because it can be changed into a prime (1221021106121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348662185 + ... + 348665686.

It is an arithmetic number, because the mean of its divisors is an integer number (163174722048).

Almost surely, 2^{1221021102121} is an apocalyptic number.

It is an amenable number.

1221021102121 is a deficient number, since it is larger than the sum of its proper divisors (84376674263).

1221021102121 is a wasteful number, since it uses less digits than its factorization.

1221021102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697327991.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221021102121 its reverse (1212011201221), we get a palindrome (2433032303342).

The spelling of 1221021102121 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred two thousand, one hundred twenty-one".