21725165424343 has 4 divisors (see below), whose sum is σ = 21725174746800. Its totient is φ = 21725156101888.

The previous prime is 21725165424317. The next prime is 21725165424397. The reversal of 21725165424343 is 34342456152712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21725165424343 - 2⁴¹ = 19526142168791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725165421343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2265558 + ... + 6970156.

It is an arithmetic number, because the mean of its divisors is an integer number (5431293686700).

Almost surely, 2^{21725165424343} is an apocalyptic number.

21725165424343 is a deficient number, since it is larger than the sum of its proper divisors (9322457).

21725165424343 is an equidigital number, since it uses as much as digits as its factorization.

21725165424343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322456.

The product of its digits is 4838400, while the sum is 49.

The spelling of 21725165424343 in words is "twenty-one trillion, seven hundred twenty-five billion, one hundred sixty-five million, four hundred twenty-four thousand, three hundred forty-three".