121756247636 has 6 divisors (see below), whose sum is σ = 213073433370. Its totient is φ = 60878123816.

The previous prime is 121756247629. The next prime is 121756247681. The reversal of 121756247636 is 636742657121.

121756247636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 106565685136 + 15190562500 = 326444^2 + 123250^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15219530951 + ... + 15219530958.

It is an arithmetic number, because the mean of its divisors is an integer number (35512238895).

Almost surely, 2^121756247636 is an apocalyptic number.

It is an amenable number.

121756247636 is a deficient number, since it is larger than the sum of its proper divisors (91317185734).

121756247636 is a wasteful number, since it uses less digits than its factorization.

121756247636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30439061913 (or 30439061911 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 50.

The spelling of 121756247636 in words is "one hundred twenty-one billion, seven hundred fifty-six million, two hundred forty-seven thousand, six hundred thirty-six".