21020030323 has 8 divisors (see below), whose sum is σ = 21163107600. Its totient is φ = 20877238368.

The previous prime is 21020030309. The next prime is 21020030327. The reversal of 21020030323 is 32303002012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020030323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020030297 and 21020030306.

It is not an unprimeable number, because it can be changed into a prime (21020030327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77565 + ... + 219217.

It is an arithmetic number, because the mean of its divisors is an integer number (2645388450).

Almost surely, 2^21020030323 is an apocalyptic number.

21020030323 is a deficient number, since it is larger than the sum of its proper divisors (143077277).

21020030323 is a wasteful number, since it uses less digits than its factorization.

21020030323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142661.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21020030323 its reverse (32303002012), we get a palindrome (53323032335).

The spelling of 21020030323 in words is "twenty-one billion, twenty million, thirty thousand, three hundred twenty-three".