21746938299 has 4 divisors (see below), whose sum is σ = 28995917736. Its totient is φ = 14497958864.

The previous prime is 21746938249. The next prime is 21746938331. The reversal of 21746938299 is 99283964712.

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 21746938299 - 2²¹ = 21744841147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21746938249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624489714 + ... + 3624489719.

It is an arithmetic number, because the mean of its divisors is an integer number (7248979434).

Almost surely, 2^21746938299 is an apocalyptic number.

21746938299 is a deficient number, since it is larger than the sum of its proper divisors (7248979437).

21746938299 is an equidigital number, since it uses as much as digits as its factorization.

21746938299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248979436.

The product of its digits is 11757312, while the sum is 60.

The spelling of 21746938299 in words is "twenty-one billion, seven hundred forty-six million, nine hundred thirty-eight thousand, two hundred ninety-nine".