12440311021 has 4 divisors (see below), whose sum is σ = 12440585344. Its totient is φ = 12440036700.

The previous prime is 12440311003. The next prime is 12440311031. The reversal of 12440311021 is 12011304421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12011304421 = 23 ⋅522230627.

It is a cyclic number.

It is not a de Polignac number, because 12440311021 - 2¹³ = 12440302829 is a prime.

It is a super-2 number, since 2×12440311021² (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 12440311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440311031) 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, 51165 + ... + 165826.

It is an arithmetic number, because the mean of its divisors is an integer number (3110146336).

Almost surely, 2^12440311021 is an apocalyptic number.

It is an amenable number.

12440311021 is a deficient number, since it is larger than the sum of its proper divisors (274323).

12440311021 is an equidigital number, since it uses as much as digits as its factorization.

12440311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274322.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12440311021 its reverse (12011304421), we get a palindrome (24451615442).

It can be divided in two parts, 124403 and 11021, that added together give a square (135424 = 368²).

The spelling of 12440311021 in words is "twelve billion, four hundred forty million, three hundred eleven thousand, twenty-one".