12921893 has 2 divisors, whose sum is σ = 12921894. Its totient is φ = 12921892.

The previous prime is 12921863. The next prime is 12921901. The reversal of 12921893 is 39812921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6880129 + 6041764 = 2623^2 + 2458^2 .

It is an emirp because it is prime and its reverse (39812921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12921893 - 2⁶ = 12921829 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12921833) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460946 + 6460947.

It is an arithmetic number, because the mean of its divisors is an integer number (6460947).

Almost surely, 2^12921893 is an apocalyptic number.

It is an amenable number.

12921893 is a deficient number, since it is larger than the sum of its proper divisors (1).

12921893 is an equidigital number, since it uses as much as digits as its factorization.

12921893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 12921893 is about 3594.7034648215. The cubic root of 12921893 is about 234.6616104480.

It can be divided in two parts, 129 and 21893, that added together give a palindrome (22022).

The spelling of 12921893 in words is "twelve million, nine hundred twenty-one thousand, eight hundred ninety-three".