21416342667 has 4 divisors (see below), whose sum is σ = 28555123560. Its totient is φ = 14277561776.

The previous prime is 21416342641. The next prime is 21416342687. The reversal of 21416342667 is 76624361412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21416342667 - 2¹⁰ = 21416341643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21416342687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3569390442 + ... + 3569390447.

It is an arithmetic number, because the mean of its divisors is an integer number (7138780890).

Almost surely, 2^21416342667 is an apocalyptic number.

21416342667 is a deficient number, since it is larger than the sum of its proper divisors (7138780893).

21416342667 is an equidigital number, since it uses as much as digits as its factorization.

21416342667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138780892.

The product of its digits is 290304, while the sum is 42.

The spelling of 21416342667 in words is "twenty-one billion, four hundred sixteen million, three hundred forty-two thousand, six hundred sixty-seven".