21203202323 has 16 divisors (see below), whose sum is σ = 22512721920. Its totient is φ = 19913294016.

The previous prime is 21203202311. The next prime is 21203202373. The reversal of 21203202323 is 32320230212.

It is a cyclic number.

It is not a de Polignac number, because 21203202323 - 2⁶ = 21203202259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203202295 and 21203202304.

It is not an unprimeable number, because it can be changed into a prime (21203202373) 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, 3995690 + ... + 4000992.

It is an arithmetic number, because the mean of its divisors is an integer number (1407045120).

Almost surely, 2^21203202323 is an apocalyptic number.

21203202323 is a deficient number, since it is larger than the sum of its proper divisors (1309519597).

21203202323 is a wasteful number, since it uses less digits than its factorization.

21203202323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21203202323 its reverse (32320230212), we get a palindrome (53523432535).

The spelling of 21203202323 in words is "twenty-one billion, two hundred three million, two hundred two thousand, three hundred twenty-three".