12440213021 has 8 divisors (see below), whose sum is σ = 13158916800. Its totient is φ = 11736328032.

The previous prime is 12440213017. The next prime is 12440213047. The reversal of 12440213021 is 12031204421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12440213021 - 2² = 12440213017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12440212984 and 12440213002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440213321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3702971 + ... + 3706328.

It is an arithmetic number, because the mean of its divisors is an integer number (1644864600).

Almost surely, 2^12440213021 is an apocalyptic number.

It is an amenable number.

12440213021 is a deficient number, since it is larger than the sum of its proper divisors (718703779).

12440213021 is an equidigital number, since it uses as much as digits as its factorization.

12440213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7409395.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12440213021 its reverse (12031204421), we get a palindrome (24471417442).

The spelling of 12440213021 in words is "twelve billion, four hundred forty million, two hundred thirteen thousand, twenty-one".