21020002323 has 16 divisors (see below), whose sum is σ = 28254348672. Its totient is φ = 13899600000.

The previous prime is 21020002319. The next prime is 21020002357. The reversal of 21020002323 is 32320002012.

It is not a de Polignac number, because 21020002323 - 2² = 21020002319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020002363) 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, 872763 + ... + 896523.

It is an arithmetic number, because the mean of its divisors is an integer number (1765896792).

Almost surely, 2^21020002323 is an apocalyptic number.

21020002323 is a deficient number, since it is larger than the sum of its proper divisors (7234346349).

21020002323 is a wasteful number, since it uses less digits than its factorization.

21020002323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26146.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21020002323 its reverse (32320002012), we get a palindrome (53340004335).

The spelling of 21020002323 in words is "twenty-one billion, twenty million, two thousand, three hundred twenty-three".