121221012112121 has 8 divisors (see below), whose sum is σ = 127667767492320. Its totient is φ = 114780926943072.

The previous prime is 121221012112097. The next prime is 121221012112127. The reversal of 121221012112121 is 121211210122121.

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 a de Polignac number, because none of the positive numbers 2^k-121221012112121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121221012112093 and 121221012112102.

It is not an unprimeable number, because it can be changed into a prime (121221012112127) 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, 1667515475 + ... + 1667588168.

It is an arithmetic number, because the mean of its divisors is an integer number (15958470936540).

Almost surely, 2^{121221012112121} is an apocalyptic number.

It is an amenable number.

121221012112121 is a deficient number, since it is larger than the sum of its proper divisors (6446755380199).

121221012112121 is a wasteful number, since it uses less digits than its factorization.

121221012112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335105575.

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

Adding to 121221012112121 its reverse (121211210122121), we get a palindrome (242432222234242).

The spelling of 121221012112121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred twelve thousand, one hundred twenty-one".