21320065471 has 8 divisors (see below), whose sum is σ = 22504694400. Its totient is φ = 20141688600.

The previous prime is 21320065453. The next prime is 21320065489. The reversal of 21320065471 is 17456002312.

It is an interprime number because it is at equal distance from previous prime (21320065453) and next prime (21320065489).

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

It is a cyclic number.

It is not a de Polignac number, because 21320065471 - 2¹⁷ = 21319934399 is a prime.

It is a super-3 number, since 3×21320065471³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320065451) 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, 1556005 + ... + 1569646.

It is an arithmetic number, because the mean of its divisors is an integer number (2813086800).

Almost surely, 2^21320065471 is an apocalyptic number.

21320065471 is a deficient number, since it is larger than the sum of its proper divisors (1184628929).

21320065471 is a wasteful number, since it uses less digits than its factorization.

21320065471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3126029.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 21320065471 its reverse (17456002312), we get a palindrome (38776067783).

The spelling of 21320065471 in words is "twenty-one billion, three hundred twenty million, sixty-five thousand, four hundred seventy-one".