21320353235 has 4 divisors (see below), whose sum is σ = 25584423888. Its totient is φ = 17056282584.

The previous prime is 21320353211. The next prime is 21320353237. The reversal of 21320353235 is 53235302312.

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 21320353235 - 2¹⁶ = 21320287699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320353198 and 21320353207.

It is not an unprimeable number, because it can be changed into a prime (21320353237) 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, 2132035319 + ... + 2132035328.

It is an arithmetic number, because the mean of its divisors is an integer number (6396105972).

Almost surely, 2^21320353235 is an apocalyptic number.

21320353235 is a deficient number, since it is larger than the sum of its proper divisors (4264070653).

21320353235 is an equidigital number, since it uses as much as digits as its factorization.

21320353235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264070652.

The product of its (nonzero) digits is 16200, while the sum is 29.

Adding to 21320353235 its reverse (53235302312), we get a palindrome (74555655547).

The spelling of 21320353235 in words is "twenty-one billion, three hundred twenty million, three hundred fifty-three thousand, two hundred thirty-five".