21417730467 has 16 divisors (see below), whose sum is σ = 32707971072. Its totient is φ = 12211917120.

The previous prime is 21417730457. The next prime is 21417730489. The reversal of 21417730467 is 76403771412.

It is a happy number.

It is not a de Polignac number, because 21417730467 - 2¹¹ = 21417728419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21417730417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1106259 + ... + 1125452.

It is an arithmetic number, because the mean of its divisors is an integer number (2044248192).

Almost surely, 2^21417730467 is an apocalyptic number.

21417730467 is a deficient number, since it is larger than the sum of its proper divisors (11290240605).

21417730467 is a wasteful number, since it uses less digits than its factorization.

21417730467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232178.

The product of its (nonzero) digits is 197568, while the sum is 42.

The spelling of 21417730467 in words is "twenty-one billion, four hundred seventeen million, seven hundred thirty thousand, four hundred sixty-seven".