21476256505 has 32 divisors (see below), whose sum is σ = 28933003008. Its totient is φ = 15166022400.

The previous prime is 21476256467. The next prime is 21476256521. The reversal of 21476256505 is 50565267412.

It is not a de Polignac number, because 21476256505 - 2²¹ = 21474159353 is a prime.

It is a super-2 number, since 2×21476256505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1013115 + ... + 1034095.

It is an arithmetic number, because the mean of its divisors is an integer number (904156344).

Almost surely, 2^21476256505 is an apocalyptic number.

It is an amenable number.

21476256505 is a deficient number, since it is larger than the sum of its proper divisors (7456746503).

21476256505 is a wasteful number, since it uses less digits than its factorization.

21476256505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21537.

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 21476256505 in words is "twenty-one billion, four hundred seventy-six million, two hundred fifty-six thousand, five hundred five".