121211221210121 has 16 divisors (see below), whose sum is σ = 138578022374400. Its totient is φ = 103857150113808.

The previous prime is 121211221210087. The next prime is 121211221210159. The reversal of 121211221210121 is 121012122112121.

It is a happy number.

It is not a de Polignac number, because 121211221210121 - 2¹⁴ = 121211221193737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211221210093 and 121211221210102.

It is not an unprimeable number, because it can be changed into a prime (121211226210121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165675910 + ... + 1165779888.

It is an arithmetic number, because the mean of its divisors is an integer number (8661126398400).

Almost surely, 2^{121211221210121} is an apocalyptic number.

It is an amenable number.

121211221210121 is a deficient number, since it is larger than the sum of its proper divisors (17366801164279).

121211221210121 is a wasteful number, since it uses less digits than its factorization.

121211221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163588.

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

Adding to 121211221210121 its reverse (121012122112121), we get a palindrome (242223343322242).

The spelling of 121211221210121 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".