21330124321 has 4 divisors (see below), whose sum is σ = 23269226544. Its totient is φ = 19391022100.

The previous prime is 21330124303. The next prime is 21330124327. The reversal of 21330124321 is 12342103312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21330124321 - 2⁵ = 21330124289 is a prime.

It is a super-2 number, since 2×21330124321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330124292 and 21330124301.

It is not an unprimeable number, because it can be changed into a prime (21330124327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969551095 + ... + 969551116.

It is an arithmetic number, because the mean of its divisors is an integer number (5817306636).

Almost surely, 2^21330124321 is an apocalyptic number.

It is an amenable number.

21330124321 is a deficient number, since it is larger than the sum of its proper divisors (1939102223).

21330124321 is a wasteful number, since it uses less digits than its factorization.

21330124321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939102222.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21330124321 its reverse (12342103312), we get a palindrome (33672227633).

The spelling of 21330124321 in words is "twenty-one billion, three hundred thirty million, one hundred twenty-four thousand, three hundred twenty-one".