21301332321 has 16 divisors (see below), whose sum is σ = 28518661440. Its totient is φ = 14142488640.

The previous prime is 21301332319. The next prime is 21301332323. The reversal of 21301332321 is 12323310312.

It is an interprime number because it is at equal distance from previous prime (21301332319) and next prime (21301332323).

It is not a de Polignac number, because 21301332321 - 2¹ = 21301332319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21301332323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3420991 + ... + 3427211.

It is an arithmetic number, because the mean of its divisors is an integer number (1782416340).

Almost surely, 2^21301332321 is an apocalyptic number.

It is an amenable number.

21301332321 is a deficient number, since it is larger than the sum of its proper divisors (7217329119).

21301332321 is a wasteful number, since it uses less digits than its factorization.

21301332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21301332321 its reverse (12323310312), we get a palindrome (33624642633).

The spelling of 21301332321 in words is "twenty-one billion, three hundred one million, three hundred thirty-two thousand, three hundred twenty-one".