121216156508 has 12 divisors (see below), whose sum is σ = 212249294880. Its totient is φ = 60573500832.

The previous prime is 121216156489. The next prime is 121216156513. The reversal of 121216156508 is 805651612121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8636468 + ... + 8650491.

It is an arithmetic number, because the mean of its divisors is an integer number (17687441240).

Almost surely, 2^121216156508 is an apocalyptic number.

It is an amenable number.

121216156508 is a deficient number, since it is larger than the sum of its proper divisors (91033138372).

121216156508 is a wasteful number, since it uses less digits than its factorization.

121216156508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17288716 (or 17288714 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

Adding to 121216156508 its reverse (805651612121), we get a palindrome (926867768629).

The spelling of 121216156508 in words is "one hundred twenty-one billion, two hundred sixteen million, one hundred fifty-six thousand, five hundred eight".