21046245203 has 4 divisors (see below), whose sum is σ = 21049647600. Its totient is φ = 21042842808.

The previous prime is 21046245167. The next prime is 21046245257. The reversal of 21046245203 is 30254264012.

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 21046245203 - 2¹⁸ = 21045983059 is a prime.

It is a super-2 number, since 2×21046245203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046245263) 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, 1691903 + ... + 1704296.

It is an arithmetic number, because the mean of its divisors is an integer number (5262411900).

Almost surely, 2^21046245203 is an apocalyptic number.

21046245203 is a deficient number, since it is larger than the sum of its proper divisors (3402397).

21046245203 is an equidigital number, since it uses as much as digits as its factorization.

21046245203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402396.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 21046245203 in words is "twenty-one billion, forty-six million, two hundred forty-five thousand, two hundred three".