21002104321 has 8 divisors (see below), whose sum is σ = 22943260800. Its totient is φ = 19066260240.

The previous prime is 21002104313. The next prime is 21002104337. The reversal of 21002104321 is 12340120012.

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 21002104321 - 2³ = 21002104313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002104295 and 21002104304.

It is not an unprimeable number, because it can be changed into a prime (21002104121) 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, 1319826 + ... + 1335643.

It is an arithmetic number, because the mean of its divisors is an integer number (2867907600).

Almost surely, 2^21002104321 is an apocalyptic number.

It is an amenable number.

21002104321 is a deficient number, since it is larger than the sum of its proper divisors (1941156479).

21002104321 is a wasteful number, since it uses less digits than its factorization.

21002104321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2656199.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002104321 its reverse (12340120012), we get a palindrome (33342224333).

The spelling of 21002104321 in words is "twenty-one billion, two million, one hundred four thousand, three hundred twenty-one".