12440124021 has 16 divisors (see below), whose sum is σ = 17864942144. Its totient is φ = 7654518144.

The previous prime is 12440124007. The next prime is 12440124023. The reversal of 12440124021 is 12042104421.

It is not a de Polignac number, because 12440124021 - 2⁵ = 12440123989 is a prime.

It is a super-2 number, since 2×12440124021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440124023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433305 + ... + 461121.

It is an arithmetic number, because the mean of its divisors is an integer number (1116558884).

Almost surely, 2^12440124021 is an apocalyptic number.

It is an amenable number.

12440124021 is a deficient number, since it is larger than the sum of its proper divisors (5424818123).

12440124021 is a wasteful number, since it uses less digits than its factorization.

12440124021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39300.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 12440124021 its reverse (12042104421), we get a palindrome (24482228442).

The spelling of 12440124021 in words is "twelve billion, four hundred forty million, one hundred twenty-four thousand, twenty-one".