12402444021 has 16 divisors (see below), whose sum is σ = 18059216448. Its totient is φ = 7508592000.

The previous prime is 12402444017. The next prime is 12402444023. The reversal of 12402444021 is 12044420421.

It is not a de Polignac number, because 12402444021 - 2² = 12402444017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12402443982 and 12402444000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12402444023) 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, 169630 + ... + 231471.

It is an arithmetic number, because the mean of its divisors is an integer number (1128701028).

Almost surely, 2^12402444021 is an apocalyptic number.

12402444021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12402444021 is a deficient number, since it is larger than the sum of its proper divisors (5656772427).

12402444021 is a wasteful number, since it uses less digits than its factorization.

12402444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402052.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 12402444021 its reverse (12044420421), we get a palindrome (24446864442).

The spelling of 12402444021 in words is "twelve billion, four hundred two million, four hundred forty-four thousand, twenty-one".