12465340021 has 2 divisors, whose sum is σ = 12465340022. Its totient is φ = 12465340020.

The previous prime is 12465340001. The next prime is 12465340067. The reversal of 12465340021 is 12004356421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10427268996 + 2038071025 = 102114^2 + 45145^2 .

It is a cyclic number.

It is not a de Polignac number, because 12465340021 - 2⁵ = 12465339989 is a prime.

It is a super-3 number, since 3×12465340021³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12465340001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6232670010 + 6232670011.

It is an arithmetic number, because the mean of its divisors is an integer number (6232670011).

Almost surely, 2^12465340021 is an apocalyptic number.

It is an amenable number.

12465340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12465340021 is an equidigital number, since it uses as much as digits as its factorization.

12465340021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 12465340021 its reverse (12004356421), we get a palindrome (24469696442).

The spelling of 12465340021 in words is "twelve billion, four hundred sixty-five million, three hundred forty thousand, twenty-one".