121512215122 has 16 divisors (see below), whose sum is σ = 183672830880. Its totient is φ = 60288382368.

The previous prime is 121512215119. The next prime is 121512215129. The reversal of 121512215122 is 221512215121.

It is not an unprimeable number, because it can be changed into a prime (121512215129) 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, 442398 + ... + 662374.

It is an arithmetic number, because the mean of its divisors is an integer number (11479551930).

Almost surely, 2^121512215122 is an apocalyptic number.

121512215122 is a deficient number, since it is larger than the sum of its proper divisors (62160615758).

121512215122 is a wasteful number, since it uses less digits than its factorization.

121512215122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222105.

The product of its digits is 800, while the sum is 25.

Subtracting 121512215122 from its reverse (221512215121), we obtain a palindrome (99999999999).

The spelling of 121512215122 in words is "one hundred twenty-one billion, five hundred twelve million, two hundred fifteen thousand, one hundred twenty-two".