21730352399 has 8 divisors (see below), whose sum is σ = 25030238208. Its totient is φ = 18479354040.

The previous prime is 21730352387. The next prime is 21730352411. The reversal of 21730352399 is 99325303712.

It is an interprime number because it is at equal distance from previous prime (21730352387) and next prime (21730352411).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21730352399 - 2⁸ = 21730352143 is a prime.

It is a super-3 number, since 3×21730352399³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21730352299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12220907 + ... + 12222684.

It is an arithmetic number, because the mean of its divisors is an integer number (3128779776).

Almost surely, 2^21730352399 is an apocalyptic number.

21730352399 is a deficient number, since it is larger than the sum of its proper divisors (3299885809).

21730352399 is a wasteful number, since it uses less digits than its factorization.

21730352399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24443725.

The product of its (nonzero) digits is 306180, while the sum is 44.

The spelling of 21730352399 in words is "twenty-one billion, seven hundred thirty million, three hundred fifty-two thousand, three hundred ninety-nine".