121243510115 has 32 divisors (see below), whose sum is σ = 179091513216. Its totient is φ = 76732784640.

The previous prime is 121243510079. The next prime is 121243510151. The reversal of 121243510115 is 511015342121.

It is an interprime number because it is at equal distance from previous prime (121243510079) and next prime (121243510151).

It is not a de Polignac number, because 121243510115 - 2²⁰ = 121242461539 is a prime.

It is a super-2 number, since 2×121243510115² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4734245 + ... + 4759785.

It is an arithmetic number, because the mean of its divisors is an integer number (5596609788).

Almost surely, 2^121243510115 is an apocalyptic number.

121243510115 is a deficient number, since it is larger than the sum of its proper divisors (57848003101).

121243510115 is a wasteful number, since it uses less digits than its factorization.

121243510115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35999.

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

Adding to 121243510115 its reverse (511015342121), we get a palindrome (632258852236).

The spelling of 121243510115 in words is "one hundred twenty-one billion, two hundred forty-three million, five hundred ten thousand, one hundred fifteen".