21245635203 has 8 divisors (see below), whose sum is σ = 30506553168. Its totient is φ = 13074237024.

The previous prime is 21245635183. The next prime is 21245635249. The reversal of 21245635203 is 30253654212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21245635203 - 2¹² = 21245631107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21245635603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272379900 + ... + 272379977.

It is an arithmetic number, because the mean of its divisors is an integer number (3813319146).

Almost surely, 2^21245635203 is an apocalyptic number.

21245635203 is a deficient number, since it is larger than the sum of its proper divisors (9260917965).

21245635203 is a wasteful number, since it uses less digits than its factorization.

21245635203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544759893.

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 21245635203 in words is "twenty-one billion, two hundred forty-five million, six hundred thirty-five thousand, two hundred three".