121723987398 has 16 divisors (see below), whose sum is σ = 262174742256. Its totient is φ = 37453534560.

The previous prime is 121723987397. The next prime is 121723987457. The reversal of 121723987398 is 893789327121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121723987397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780281893 + ... + 780282048.

It is an arithmetic number, because the mean of its divisors is an integer number (16385921391).

Almost surely, 2^121723987398 is an apocalyptic number.

121723987398 is an abundant number, since it is smaller than the sum of its proper divisors (140450754858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121723987398 is a wasteful number, since it uses less digits than its factorization.

121723987398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560563959.

The product of its digits is 9144576, while the sum is 60.

The spelling of 121723987398 in words is "one hundred twenty-one billion, seven hundred twenty-three million, nine hundred eighty-seven thousand, three hundred ninety-eight".