21003220323 has 16 divisors (see below), whose sum is σ = 31124714400. Its totient is φ = 13998172320.

The previous prime is 21003220319. The next prime is 21003220351. The reversal of 21003220323 is 32302230012.

It is a happy number.

21003220323 is a `hidden beast` number, since 21 + 0 + 0 + 322 + 0 + 323 = 666.

It is not a de Polignac number, because 21003220323 - 2² = 21003220319 is a prime.

It is a super-2 number, since 2×21003220323² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003220296 and 21003220305.

It is not an unprimeable number, because it can be changed into a prime (21003220423) 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, 11928 + ... + 205301.

It is an arithmetic number, because the mean of its divisors is an integer number (1945294650).

Almost surely, 2^21003220323 is an apocalyptic number.

21003220323 is a deficient number, since it is larger than the sum of its proper divisors (10121494077).

21003220323 is a wasteful number, since it uses less digits than its factorization.

21003220323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220819 (or 220813 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21003220323 its reverse (32302230012), we get a palindrome (53305450335).

The spelling of 21003220323 in words is "twenty-one billion, three million, two hundred twenty thousand, three hundred twenty-three".