21303322405 has 32 divisors (see below), whose sum is σ = 27329581440. Its totient is φ = 15894984960.

The previous prime is 21303322379. The next prime is 21303322409. The reversal of 21303322405 is 50422330312.

It is not a de Polignac number, because 21303322405 - 2⁷ = 21303322277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21303322405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303322409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2305695 + ... + 2314915.

It is an arithmetic number, because the mean of its divisors is an integer number (854049420).

Almost surely, 2^21303322405 is an apocalyptic number.

It is an amenable number.

21303322405 is a deficient number, since it is larger than the sum of its proper divisors (6026259035).

21303322405 is a wasteful number, since it uses less digits than its factorization.

21303322405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9621.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21303322405 its reverse (50422330312), we get a palindrome (71725652717).

The spelling of 21303322405 in words is "twenty-one billion, three hundred three million, three hundred twenty-two thousand, four hundred five".