121512211671201 has 16 divisors (see below), whose sum is σ = 174590135684160. Its totient is φ = 74729147423040.

The previous prime is 121512211671161. The next prime is 121512211671211. The reversal of 121512211671201 is 102176112215121.

It is a happy number.

It is not a de Polignac number, because 121512211671201 - 2³⁴ = 121495031802017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121512211671211) 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, 991567546 + ... + 991690083.

It is an arithmetic number, because the mean of its divisors is an integer number (10911883480260).

Almost surely, 2^{121512211671201} is an apocalyptic number.

It is an amenable number.

121512211671201 is a deficient number, since it is larger than the sum of its proper divisors (53077924012959).

121512211671201 is a wasteful number, since it uses less digits than its factorization.

121512211671201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983259216.

The product of its (nonzero) digits is 3360, while the sum is 33.

Adding to 121512211671201 its reverse (102176112215121), we get a palindrome (223688323886322).

The spelling of 121512211671201 in words is "one hundred twenty-one trillion, five hundred twelve billion, two hundred eleven million, six hundred seventy-one thousand, two hundred one".