21004300245 has 16 divisors (see below), whose sum is σ = 33694636032. Its totient is φ = 11173041600.

The previous prime is 21004300243. The next prime is 21004300249. The reversal of 21004300245 is 54200340012.

It is not a de Polignac number, because 21004300245 - 2¹ = 21004300243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004300243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1822306 + ... + 1833795.

It is an arithmetic number, because the mean of its divisors is an integer number (2105914752).

Almost surely, 2^21004300245 is an apocalyptic number.

It is an amenable number.

21004300245 is a deficient number, since it is larger than the sum of its proper divisors (12690335787).

21004300245 is a wasteful number, since it uses less digits than its factorization.

21004300245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656492.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21004300245 its reverse (54200340012), we get a palindrome (75204640257).

The spelling of 21004300245 in words is "twenty-one billion, four million, three hundred thousand, two hundred forty-five".