21415011500505 has 16 divisors (see below), whose sum is σ = 39158878172544. Its totient is φ = 9789719543040.

The previous prime is 21415011500447. The next prime is 21415011500513. The reversal of 21415011500505 is 50500511051412.

It is not a de Polignac number, because 21415011500505 - 2¹¹ = 21415011498457 is a prime.

It is a super-2 number, since 2×21415011500505² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101976245136 + ... + 101976245345.

It is an arithmetic number, because the mean of its divisors is an integer number (2447429885784).

Almost surely, 2^{21415011500505} is an apocalyptic number.

It is an amenable number.

21415011500505 is a deficient number, since it is larger than the sum of its proper divisors (17743866672039).

21415011500505 is a wasteful number, since it uses less digits than its factorization.

21415011500505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203952490496.

The product of its (nonzero) digits is 5000, while the sum is 30.

Adding to 21415011500505 its reverse (50500511051412), we get a palindrome (71915522551917).

The spelling of 21415011500505 in words is "twenty-one trillion, four hundred fifteen billion, eleven million, five hundred thousand, five hundred five".