21403300205 has 24 divisors (see below), whose sum is σ = 29908174968. Its totient is φ = 14661362688.

The previous prime is 21403300199. The next prime is 21403300213. The reversal of 21403300205 is 50200330412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14472571204 + 6930729001 = 120302^2 + 83251^2 .

It is not a de Polignac number, because 21403300205 - 2¹⁴ = 21403283821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194657 + ... + 284073.

It is an arithmetic number, because the mean of its divisors is an integer number (1246173957).

Almost surely, 2^21403300205 is an apocalyptic number.

It is an amenable number.

21403300205 is a deficient number, since it is larger than the sum of its proper divisors (8504874763).

21403300205 is an equidigital number, since it uses as much as digits as its factorization.

21403300205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90413 (or 90406 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21403300205 its reverse (50200330412), we get a palindrome (71603630617).

The spelling of 21403300205 in words is "twenty-one billion, four hundred three million, three hundred thousand, two hundred five".