21296493355 has 4 divisors (see below), whose sum is σ = 25555792032. Its totient is φ = 17037194680.

The previous prime is 21296493299. The next prime is 21296493371. The reversal of 21296493355 is 55339469212.

It is a happy number.

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

It is not a de Polignac number, because 21296493355 - 2²⁷ = 21162275627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21296493299 and 21296493308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2129649331 + ... + 2129649340.

It is an arithmetic number, because the mean of its divisors is an integer number (6388948008).

Almost surely, 2^21296493355 is an apocalyptic number.

21296493355 is a deficient number, since it is larger than the sum of its proper divisors (4259298677).

21296493355 is an equidigital number, since it uses as much as digits as its factorization.

21296493355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259298676.

The product of its digits is 1749600, while the sum is 49.

The spelling of 21296493355 in words is "twenty-one billion, two hundred ninety-six million, four hundred ninety-three thousand, three hundred fifty-five".