121732781863 has 12 divisors (see below), whose sum is σ = 154480933512. Its totient is φ = 94856712720.

The previous prime is 121732781843. The next prime is 121732781903. The reversal of 121732781863 is 368187237121.

It is a happy number.

It is not a de Polignac number, because 121732781863 - 2⁹ = 121732781351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121732781843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112924120 + ... + 112925197.

It is an arithmetic number, because the mean of its divisors is an integer number (12873411126).

Almost surely, 2^121732781863 is an apocalyptic number.

121732781863 is a deficient number, since it is larger than the sum of its proper divisors (32748151649).

121732781863 is a wasteful number, since it uses less digits than its factorization.

121732781863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225849342 (or 225849335 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

The spelling of 121732781863 in words is "one hundred twenty-one billion, seven hundred thirty-two million, seven hundred eighty-one thousand, eight hundred sixty-three".