21437429593 has 8 divisors (see below), whose sum is σ = 22020439880. Its totient is φ = 20854609920.

The previous prime is 21437429579. The next prime is 21437429603. The reversal of 21437429593 is 39592473412.

It can be written as a sum of positive squares in 4 ways, for example, as 1078991104 + 20358438489 = 32848^2 + 142683^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21437429593 - 2⁹ = 21437429081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21437429543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197203 + ... + 285943.

It is an arithmetic number, because the mean of its divisors is an integer number (2752554985).

Almost surely, 2^21437429593 is an apocalyptic number.

It is an amenable number.

21437429593 is a deficient number, since it is larger than the sum of its proper divisors (583010287).

21437429593 is an equidigital number, since it uses as much as digits as its factorization.

21437429593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95307.

The product of its digits is 1632960, while the sum is 49.

The spelling of 21437429593 in words is "twenty-one billion, four hundred thirty-seven million, four hundred twenty-nine thousand, five hundred ninety-three".