1326251421389 has 2 divisors, whose sum is σ = 1326251421390. Its totient is φ = 1326251421388.

The previous prime is 1326251421377. The next prime is 1326251421529. The reversal of 1326251421389 is 9831241526231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1266682720900 + 59568700489 = 1125470^2 + 244067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326251421389 - 2⁸ = 1326251421133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1326251421349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663125710694 + 663125710695.

It is an arithmetic number, because the mean of its divisors is an integer number (663125710695).

Almost surely, 2^{1326251421389} is an apocalyptic number.

It is an amenable number.

1326251421389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326251421389 is an equidigital number, since it uses as much as digits as its factorization.

1326251421389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The spelling of 1326251421389 in words is "one trillion, three hundred twenty-six billion, two hundred fifty-one million, four hundred twenty-one thousand, three hundred eighty-nine".