21535435304323 has 8 divisors (see below), whose sum is σ = 23793626730528. Its totient is φ = 19387399557504.

The previous prime is 21535435304303. The next prime is 21535435304351. The reversal of 21535435304323 is 32340353453512.

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 21535435304323 - 2⁵ = 21535435304291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21535435304323.

It is not an unprimeable number, because it can be changed into a prime (21535435304303) 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, 27538919436 + ... + 27538920217.

It is an arithmetic number, because the mean of its divisors is an integer number (2974203341316).

Almost surely, 2^{21535435304323} is an apocalyptic number.

21535435304323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21535435304323 is a deficient number, since it is larger than the sum of its proper divisors (2258191426205).

21535435304323 is a wasteful number, since it uses less digits than its factorization.

21535435304323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55077839693.

The product of its (nonzero) digits is 1944000, while the sum is 43.

Adding to 21535435304323 its reverse (32340353453512), we get a palindrome (53875788757835).

The spelling of 21535435304323 in words is "twenty-one trillion, five hundred thirty-five billion, four hundred thirty-five million, three hundred four thousand, three hundred twenty-three".