12440124251 has 4 divisors (see below), whose sum is σ = 12450933504. Its totient is φ = 12429315000.

The previous prime is 12440124223. The next prime is 12440124259. The reversal of 12440124251 is 15242104421.

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 2^k-12440124251 is a prime.

It is a super-2 number, since 2×12440124251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12440124251.

It is not an unprimeable number, because it can be changed into a prime (12440124259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5402900 + ... + 5405201.

It is an arithmetic number, because the mean of its divisors is an integer number (3112733376).

Almost surely, 2^12440124251 is an apocalyptic number.

12440124251 is a deficient number, since it is larger than the sum of its proper divisors (10809253).

12440124251 is a wasteful number, since it uses less digits than its factorization.

12440124251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10809252.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 12440124251 its reverse (15242104421), we get a palindrome (27682228672).

The spelling of 12440124251 in words is "twelve billion, four hundred forty million, one hundred twenty-four thousand, two hundred fifty-one".