21105013005 has 24 divisors (see below), whose sum is σ = 36595728000. Its totient is φ = 11251789920.

The previous prime is 21105012989. The next prime is 21105013019. The reversal of 21105013005 is 50031050112.

It is not a de Polignac number, because 21105013005 - 2⁴ = 21105012989 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 35496 + ... + 208494.

It is an arithmetic number, because the mean of its divisors is an integer number (1524822000).

Almost surely, 2^21105013005 is an apocalyptic number.

It is an amenable number.

21105013005 is a deficient number, since it is larger than the sum of its proper divisors (15490714995).

21105013005 is a wasteful number, since it uses less digits than its factorization.

21105013005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175721 (or 175718 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

Adding to 21105013005 its reverse (50031050112), we get a palindrome (71136063117).

The spelling of 21105013005 in words is "twenty-one billion, one hundred five million, thirteen thousand, five".