21323320133 has 16 divisors (see below), whose sum is σ = 23772240000. Its totient is φ = 19007695872.

The previous prime is 21323320127. The next prime is 21323320141. The reversal of 21323320133 is 33102332312.

It is a cyclic number.

It is not a de Polignac number, because 21323320133 - 2⁸ = 21323319877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323320099 and 21323320108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323320933) 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, 1763693 + ... + 1775741.

It is an arithmetic number, because the mean of its divisors is an integer number (1485765000).

Almost surely, 2^21323320133 is an apocalyptic number.

It is an amenable number.

21323320133 is a deficient number, since it is larger than the sum of its proper divisors (2448919867).

21323320133 is a wasteful number, since it uses less digits than its factorization.

21323320133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17564.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21323320133 its reverse (33102332312), we get a palindrome (54425652445).

The spelling of 21323320133 in words is "twenty-one billion, three hundred twenty-three million, three hundred twenty thousand, one hundred thirty-three".