21397365343 has 2 divisors, whose sum is σ = 21397365344. Its totient is φ = 21397365342.

The previous prime is 21397365329. The next prime is 21397365361. The reversal of 21397365343 is 34356379312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21397365343 - 2⁹ = 21397364831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21397365293 and 21397365302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21397365323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10698682671 + 10698682672.

It is an arithmetic number, because the mean of its divisors is an integer number (10698682672).

Almost surely, 2^21397365343 is an apocalyptic number.

21397365343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21397365343 is an equidigital number, since it uses as much as digits as its factorization.

21397365343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 46.

The spelling of 21397365343 in words is "twenty-one billion, three hundred ninety-seven million, three hundred sixty-five thousand, three hundred forty-three".