121808847765 has 32 divisors (see below), whose sum is σ = 214493360256. Its totient is φ = 58536181760.

The previous prime is 121808847733. The next prime is 121808847773. The reversal of 121808847765 is 567748808121.

It is not a de Polignac number, because 121808847765 - 2⁵ = 121808847733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3247884 + ... + 3285173.

It is an arithmetic number, because the mean of its divisors is an integer number (6702917508).

Almost surely, 2^121808847765 is an apocalyptic number.

121808847765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121808847765 is a deficient number, since it is larger than the sum of its proper divisors (92684512491).

121808847765 is a wasteful number, since it uses less digits than its factorization.

121808847765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533189.

The product of its (nonzero) digits is 6021120, while the sum is 57.

It can be divided in two parts, 12180 and 8847765, that added together give a triangular number (8859945 = T₄₂₀₉).

The spelling of 121808847765 in words is "one hundred twenty-one billion, eight hundred eight million, eight hundred forty-seven thousand, seven hundred sixty-five".