21323120133 has 40 divisors (see below), whose sum is σ = 33206415200. Its totient is φ = 12170287584.

The previous prime is 21323120107. The next prime is 21323120149. The reversal of 21323120133 is 33102132312.

It is not a de Polignac number, because 21323120133 - 2¹⁴ = 21323103749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323120183) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10508163 + ... + 10510191.

It is an arithmetic number, because the mean of its divisors is an integer number (830160380).

Almost surely, 2^21323120133 is an apocalyptic number.

It is an amenable number.

21323120133 is a deficient number, since it is larger than the sum of its proper divisors (11883295067).

21323120133 is an equidigital number, since it uses as much as digits as its factorization.

21323120133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21323120133 its reverse (33102132312), we get a palindrome (54425252445).

The spelling of 21323120133 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, one hundred thirty-three".