21012321329 has 8 divisors (see below), whose sum is σ = 21679781760. Its totient is φ = 20354898096.

The previous prime is 21012321289. The next prime is 21012321371. The reversal of 21012321329 is 92312321012.

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 21012321329 - 2¹² = 21012317233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21012321298 and 21012321307.

It is not an unprimeable number, because it can be changed into a prime (21012321829) 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, 2505047 + ... + 2513420.

It is an arithmetic number, because the mean of its divisors is an integer number (2709972720).

Almost surely, 2^21012321329 is an apocalyptic number.

It is an amenable number.

21012321329 is a deficient number, since it is larger than the sum of its proper divisors (667460431).

21012321329 is an equidigital number, since it uses as much as digits as its factorization.

21012321329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018599.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21012321329 in words is "twenty-one billion, twelve million, three hundred twenty-one thousand, three hundred twenty-nine".