21456614505 has 32 divisors (see below), whose sum is σ = 36262195200. Its totient is φ = 10816827840.

The previous prime is 21456614503. The next prime is 21456614521. The reversal of 21456614505 is 50541665412.

It is not a de Polignac number, because 21456614505 - 2¹ = 21456614503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21456614503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 516555 + ... + 556544.

It is an arithmetic number, because the mean of its divisors is an integer number (1133193600).

Almost surely, 2^21456614505 is an apocalyptic number.

It is an amenable number.

21456614505 is a deficient number, since it is larger than the sum of its proper divisors (14805580695).

21456614505 is a wasteful number, since it uses less digits than its factorization.

21456614505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073181.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21456614505 in words is "twenty-one billion, four hundred fifty-six million, six hundred fourteen thousand, five hundred five".