21003040323 has 12 divisors (see below), whose sum is σ = 30365244000. Its totient is φ = 13989325776.

The previous prime is 21003040309. The next prime is 21003040351. The reversal of 21003040323 is 32304030012.

21003040323 is a `hidden beast` number, since 210 + 0 + 30 + 403 + 23 = 666.

It is not a de Polignac number, because 21003040323 - 2⁴ = 21003040307 is a prime.

It is a super-2 number, since 2×21003040323² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003040296 and 21003040305.

It is not an unprimeable number, because it can be changed into a prime (21003044323) 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, 1047948 + ... + 1067801.

It is an arithmetic number, because the mean of its divisors is an integer number (2530437000).

Almost surely, 2^21003040323 is an apocalyptic number.

21003040323 is a deficient number, since it is larger than the sum of its proper divisors (9362203677).

21003040323 is a wasteful number, since it uses less digits than its factorization.

21003040323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116858 (or 2116855 counting only the distinct ones).

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

Adding to 21003040323 its reverse (32304030012), we get a palindrome (53307070335).

The spelling of 21003040323 in words is "twenty-one billion, three million, forty thousand, three hundred twenty-three".