21002365471 has 8 divisors (see below), whose sum is σ = 23004619920. Its totient is φ = 19085313408.

The previous prime is 21002365457. The next prime is 21002365499. The reversal of 21002365471 is 17456320012.

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 21002365471 - 2¹⁷ = 21002234399 is a prime.

It is a super-3 number, since 3×21002365471³ (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 (21002365451) 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, 21300081 + ... + 21301066.

It is an arithmetic number, because the mean of its divisors is an integer number (2875577490).

Almost surely, 2^21002365471 is an apocalyptic number.

21002365471 is a deficient number, since it is larger than the sum of its proper divisors (2002254449).

21002365471 is a wasteful number, since it uses less digits than its factorization.

21002365471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42601193.

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

Adding to 21002365471 its reverse (17456320012), we get a palindrome (38458685483).

The spelling of 21002365471 in words is "twenty-one billion, two million, three hundred sixty-five thousand, four hundred seventy-one".