21011363405 has 8 divisors (see below), whose sum is σ = 25216772352. Its totient is φ = 16806999888.

The previous prime is 21011363381. The next prime is 21011363411. The reversal of 21011363405 is 50436311012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011363405 - 2⁶ = 21011363341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216437 + ... + 298106.

It is an arithmetic number, because the mean of its divisors is an integer number (3152096544).

Almost surely, 2^21011363405 is an apocalyptic number.

It is an amenable number.

21011363405 is a deficient number, since it is larger than the sum of its proper divisors (4205408947).

21011363405 is an equidigital number, since it uses as much as digits as its factorization.

21011363405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522715.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21011363405 its reverse (50436311012), we get a palindrome (71447674417).

The spelling of 21011363405 in words is "twenty-one billion, eleven million, three hundred sixty-three thousand, four hundred five".