121397243763 has 18 divisors (see below), whose sum is σ = 171958955844. Its totient is φ = 76164382464.

The previous prime is 121397243711. The next prime is 121397243767. The reversal of 121397243763 is 367342793121.

It is not a de Polignac number, because 121397243763 - 2⁶ = 121397243699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121397243767) 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 17 ways as a sum of consecutive naturals, for example, 10253295 + ... + 10265127.

Almost surely, 2^121397243763 is an apocalyptic number.

121397243763 is a deficient number, since it is larger than the sum of its proper divisors (50561712081).

121397243763 is an frugal number, since it uses more digits than its factorization.

121397243763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23703 (or 11853 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 48.

Multiplying 121397243763 by its sum of digits (48), we get a square (5827067700624 = 2413932²).

The spelling of 121397243763 in words is "one hundred twenty-one billion, three hundred ninety-seven million, two hundred forty-three thousand, seven hundred sixty-three".