21130415405 has 16 divisors (see below), whose sum is σ = 27677813184. Its totient is φ = 15358586880.

The previous prime is 21130415363. The next prime is 21130415417. The reversal of 21130415405 is 50451403112.

It is not a de Polignac number, because 21130415405 - 2¹⁰ = 21130414381 is a prime.

It is a super-2 number, since 2×21130415405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 16724 + ... + 206253.

It is an arithmetic number, because the mean of its divisors is an integer number (1729863324).

Almost surely, 2^21130415405 is an apocalyptic number.

It is an amenable number.

21130415405 is a deficient number, since it is larger than the sum of its proper divisors (6547397779).

21130415405 is a wasteful number, since it uses less digits than its factorization.

21130415405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224716.

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

Adding to 21130415405 its reverse (50451403112), we get a palindrome (71581818517).

The spelling of 21130415405 in words is "twenty-one billion, one hundred thirty million, four hundred fifteen thousand, four hundred five".