121784707123 has 4 divisors (see below), whose sum is σ = 122862448008. Its totient is φ = 120706966240.

The previous prime is 121784707103. The next prime is 121784707157. The reversal of 121784707123 is 321707487121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321707487121 = 137 ⋅2348229833.

It is a cyclic number.

It is not a de Polignac number, because 121784707123 - 2²⁹ = 121247836211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121784707123.

It is not an unprimeable number, because it can be changed into a prime (121784707103) 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, 538870273 + ... + 538870498.

It is an arithmetic number, because the mean of its divisors is an integer number (30715612002).

Almost surely, 2^121784707123 is an apocalyptic number.

121784707123 is a deficient number, since it is larger than the sum of its proper divisors (1077740885).

121784707123 is a wasteful number, since it uses less digits than its factorization.

121784707123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077740884.

The product of its (nonzero) digits is 131712, while the sum is 43.

The spelling of 121784707123 in words is "one hundred twenty-one billion, seven hundred eighty-four million, seven hundred seven thousand, one hundred twenty-three".