21041315405 has 32 divisors (see below), whose sum is σ = 28080193536. Its totient is φ = 15007720000.

The previous prime is 21041315401. The next prime is 21041315413. The reversal of 21041315405 is 50451314012.

It is not a de Polignac number, because 21041315405 - 2² = 21041315401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041315401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 731750 + ... + 759960.

It is an arithmetic number, because the mean of its divisors is an integer number (877506048).

Almost surely, 2^21041315405 is an apocalyptic number.

It is an amenable number.

21041315405 is a deficient number, since it is larger than the sum of its proper divisors (7038878131).

21041315405 is a wasteful number, since it uses less digits than its factorization.

21041315405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28489.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21041315405 its reverse (50451314012), we get a palindrome (71492629417).

The spelling of 21041315405 in words is "twenty-one billion, forty-one million, three hundred fifteen thousand, four hundred five".