121516520051 has 4 divisors (see below), whose sum is σ = 121790824152. Its totient is φ = 121242215952.

The previous prime is 121516520029. The next prime is 121516520063. The reversal of 121516520051 is 150025615121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150025615121 = 239 ⋅627722239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121516520051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121516519996 and 121516520023.

It is not an unprimeable number, because it can be changed into a prime (121516520071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137151386 + ... + 137152271.

It is an arithmetic number, because the mean of its divisors is an integer number (30447706038).

Almost surely, 2^121516520051 is an apocalyptic number.

121516520051 is a deficient number, since it is larger than the sum of its proper divisors (274304101).

121516520051 is an equidigital number, since it uses as much as digits as its factorization.

121516520051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274304100.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 121516520051 in words is "one hundred twenty-one billion, five hundred sixteen million, five hundred twenty thousand, fifty-one".