121512215123 has 8 divisors (see below), whose sum is σ = 130873690416. Its totient is φ = 112152794400.

The previous prime is 121512215119. The next prime is 121512215129. The reversal of 121512215123 is 321512215121.

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 121512215123 - 2² = 121512215119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121512215092 and 121512215101.

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, 389693 + ... + 628398.

It is an arithmetic number, because the mean of its divisors is an integer number (16359211302).

Almost surely, 2^121512215123 is an apocalyptic number.

121512215123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121512215123 is a deficient number, since it is larger than the sum of its proper divisors (9361475293).

121512215123 is a wasteful number, since it uses less digits than its factorization.

121512215123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027285.

The product of its digits is 1200, while the sum is 26.

The spelling of 121512215123 in words is "one hundred twenty-one billion, five hundred twelve million, two hundred fifteen thousand, one hundred twenty-three".