It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-140121532252451 is a prime.
It is a Duffinian number.
Almost surely, 2140121532252451 is an apocalyptic number.
140121532252451 is an equidigital number, since it uses as much as digits as its factorization.
140121532252451 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1973542707852.
Adding to 140121532252451 its reverse (154252235121041), we get a palindrome (294373767373492).
The spelling of 140121532252451 in words is "one hundred forty trillion, one hundred twenty-one billion, five hundred thirty-two million, two hundred fifty-two thousand, four hundred fifty-one".