12664453021 has 32 divisors (see below), whose sum is σ = 14765904000. Its totient is φ = 10830758400.

The previous prime is 12664453003. The next prime is 12664453051. The reversal of 12664453021 is 12035446621.

It is not a de Polignac number, because 12664453021 - 2⁵ = 12664452989 is a prime.

It is a super-2 number, since 2×12664453021² (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 (12664453001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3766381 + ... + 3769741.

It is an arithmetic number, because the mean of its divisors is an integer number (461434500).

Almost surely, 2^12664453021 is an apocalyptic number.

12664453021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12664453021 is a deficient number, since it is larger than the sum of its proper divisors (2101450979).

12664453021 is a wasteful number, since it uses less digits than its factorization.

12664453021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562 (or 3540 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 12664453021 its reverse (12035446621), we get a palindrome (24699899642).

Subtracting from 12664453021 its reverse (12035446621), we obtain a square (629006400 = 25080²).

The spelling of 12664453021 in words is "twelve billion, six hundred sixty-four million, four hundred fifty-three thousand, twenty-one".