211221211102121 has 8 divisors (see below), whose sum is σ = 230427220008384. Its totient is φ = 192015882299920.

The previous prime is 211221211102049. The next prime is 211221211102129. The reversal of 211221211102121 is 121201112122112.

It is a happy number.

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 211221211102121 - 2³⁴ = 211204031232937 is a prime.

It is a super-2 number, since 2×211221211102121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221211102093 and 211221211102102.

It is not an unprimeable number, because it can be changed into a prime (211221211102129) 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, 169376525 + ... + 170619018.

It is an arithmetic number, because the mean of its divisors is an integer number (28803402501048).

Almost surely, 2^{211221211102121} is an apocalyptic number.

It is an amenable number.

211221211102121 is a deficient number, since it is larger than the sum of its proper divisors (19206008906263).

211221211102121 is a wasteful number, since it uses less digits than its factorization.

211221211102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340052031.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211221211102121 its reverse (121201112122112), we get a palindrome (332422323224233).

The spelling of 211221211102121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred twenty-one".