121512215091 has 8 divisors (see below), whose sum is σ = 163253052864. Its totient is φ = 80389760360.

The previous prime is 121512214987. The next prime is 121512215119. The reversal of 121512215091 is 190512215121.

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 121512215091 - 2¹⁷ = 121512084019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121512210091) 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, 154595301 + ... + 154596086.

It is an arithmetic number, because the mean of its divisors is an integer number (20406631608).

Almost surely, 2^121512215091 is an apocalyptic number.

121512215091 is a deficient number, since it is larger than the sum of its proper divisors (41740837773).

121512215091 is a wasteful number, since it uses less digits than its factorization.

121512215091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309191521.

The product of its (nonzero) digits is 1800, while the sum is 30.

Adding to 121512215091 its sum of digits (30), we get a palindrome (121512215121).

The spelling of 121512215091 in words is "one hundred twenty-one billion, five hundred twelve million, two hundred fifteen thousand, ninety-one".