21004853403 has 4 divisors (see below), whose sum is σ = 28006471208. Its totient is φ = 14003235600.

The previous prime is 21004853369. The next prime is 21004853413. The reversal of 21004853403 is 30435840012.

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

It is not a de Polignac number, because 21004853403 - 2¹⁴ = 21004837019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004853413) 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, 3500808898 + ... + 3500808903.

It is an arithmetic number, because the mean of its divisors is an integer number (7001617802).

Almost surely, 2^21004853403 is an apocalyptic number.

21004853403 is a deficient number, since it is larger than the sum of its proper divisors (7001617805).

21004853403 is an equidigital number, since it uses as much as digits as its factorization.

21004853403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001617804.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21004853403 in words is "twenty-one billion, four million, eight hundred fifty-three thousand, four hundred three".