121343256251 has 48 divisors (see below), whose sum is σ = 149698897920. Its totient is φ = 96313328640.

The previous prime is 121343256239. The next prime is 121343256341. The reversal of 121343256251 is 152652343121.

It is not a de Polignac number, because 121343256251 - 2¹⁸ = 121342994107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121343256851) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 84323990 + ... + 84325428.

It is an arithmetic number, because the mean of its divisors is an integer number (3118727040).

Almost surely, 2^121343256251 is an apocalyptic number.

121343256251 is a deficient number, since it is larger than the sum of its proper divisors (28355641669).

121343256251 is a wasteful number, since it uses less digits than its factorization.

121343256251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124 (or 2107 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

Adding to 121343256251 its reverse (152652343121), we get a palindrome (273995599372).

The spelling of 121343256251 in words is "one hundred twenty-one billion, three hundred forty-three million, two hundred fifty-six thousand, two hundred fifty-one".