121516120203 has 32 divisors (see below), whose sum is σ = 165994375680. Its totient is φ = 79052198400.

The previous prime is 121516120177. The next prime is 121516120211. The reversal of 121516120203 is 302021615121.

It is a happy number.

It is not a de Polignac number, because 121516120203 - 2¹² = 121516116107 is a prime.

It is a super-2 number, since 2×121516120203² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121516120283) by changing a digit.

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, 10883938 + ... + 10895096.

It is an arithmetic number, because the mean of its divisors is an integer number (5187324240).

Almost surely, 2^121516120203 is an apocalyptic number.

121516120203 is a deficient number, since it is larger than the sum of its proper divisors (44478255477).

121516120203 is a wasteful number, since it uses less digits than its factorization.

121516120203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11779.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 121516120203 its reverse (302021615121), we get a palindrome (423537735324).

The spelling of 121516120203 in words is "one hundred twenty-one billion, five hundred sixteen million, one hundred twenty thousand, two hundred three".