21435793723 has 4 divisors (see below), whose sum is σ = 21442887648. Its totient is φ = 21428699800.

The previous prime is 21435793721. The next prime is 21435793811. The reversal of 21435793723 is 32739753412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21435793723 - 2¹ = 21435793721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435793721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542428 + ... + 3548473.

It is an arithmetic number, because the mean of its divisors is an integer number (5360721912).

Almost surely, 2^21435793723 is an apocalyptic number.

21435793723 is a deficient number, since it is larger than the sum of its proper divisors (7093925).

21435793723 is an equidigital number, since it uses as much as digits as its factorization.

21435793723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093924.

The product of its digits is 952560, while the sum is 46.

The spelling of 21435793723 in words is "twenty-one billion, four hundred thirty-five million, seven hundred ninety-three thousand, seven hundred twenty-three".