12464161921 has 2 divisors, whose sum is σ = 12464161922. Its totient is φ = 12464161920.

The previous prime is 12464161891. The next prime is 12464161979. The reversal of 12464161921 is 12916146421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9357660225 + 3106501696 = 96735^2 + 55736^2 .

It is an emirp because it is prime and its reverse (12916146421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12464161921 - 2⁷ = 12464161793 is a prime.

It is not a weakly prime, because it can be changed into another prime (12464161121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6232080960 + 6232080961.

It is an arithmetic number, because the mean of its divisors is an integer number (6232080961).

Almost surely, 2^12464161921 is an apocalyptic number.

It is an amenable number.

12464161921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12464161921 is an equidigital number, since it uses as much as digits as its factorization.

12464161921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The spelling of 12464161921 in words is "twelve billion, four hundred sixty-four million, one hundred sixty-one thousand, nine hundred twenty-one".