21251423535343 has 2 divisors, whose sum is σ = 21251423535344. Its totient is φ = 21251423535342.

The previous prime is 21251423535319. The next prime is 21251423535413. The reversal of 21251423535343 is 34353532415212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21251423535343 - 2²⁹ = 21250886664431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21251423535343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21251423532343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625711767671 + 10625711767672.

It is an arithmetic number, because the mean of its divisors is an integer number (10625711767672).

Almost surely, 2^{21251423535343} is an apocalyptic number.

21251423535343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21251423535343 is an equidigital number, since it uses as much as digits as its factorization.

21251423535343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 43.

The spelling of 21251423535343 in words is "twenty-one trillion, two hundred fifty-one billion, four hundred twenty-three million, five hundred thirty-five thousand, three hundred forty-three".