21030213321 has 12 divisors (see below), whose sum is σ = 32713665348. Its totient is φ = 12941669664.

The previous prime is 21030213319. The next prime is 21030213343. The reversal of 21030213321 is 12331203012.

21030213321 is a `hidden beast` number, since 210 + 302 + 133 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13348567296 + 7681646025 = 115536^2 + 87645^2 .

It is not a de Polignac number, because 21030213321 - 2¹ = 21030213319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21030213294 and 21030213303.

It is not an unprimeable number, because it can be changed into a prime (21030213311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89872590 + ... + 89872823.

It is an arithmetic number, because the mean of its divisors is an integer number (2726138779).

Almost surely, 2^21030213321 is an apocalyptic number.

It is an amenable number.

21030213321 is a deficient number, since it is larger than the sum of its proper divisors (11683452027).

21030213321 is a wasteful number, since it uses less digits than its factorization.

21030213321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179745432 (or 179745429 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21030213321 its reverse (12331203012), we get a palindrome (33361416333).

The spelling of 21030213321 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, three hundred twenty-one".