21035112353 has 4 divisors (see below), whose sum is σ = 21271462020. Its totient is φ = 20798762688.

The previous prime is 21035112269. The next prime is 21035112421. The reversal of 21035112353 is 35321153012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6999497569 + 14035614784 = 83663^2 + 118472^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035112353 - 2¹⁴ = 21035095969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035112053) 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, 118174700 + ... + 118174877.

It is an arithmetic number, because the mean of its divisors is an integer number (5317865505).

Almost surely, 2^21035112353 is an apocalyptic number.

It is an amenable number.

21035112353 is a deficient number, since it is larger than the sum of its proper divisors (236349667).

21035112353 is an equidigital number, since it uses as much as digits as its factorization.

21035112353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236349666.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 21035112353 its reverse (35321153012), we get a palindrome (56356265365).

The spelling of 21035112353 in words is "twenty-one billion, thirty-five million, one hundred twelve thousand, three hundred fifty-three".