21323220133 has 4 divisors (see below), whose sum is σ = 21326312448. Its totient is φ = 21320127820.

The previous prime is 21323220097. The next prime is 21323220169. The reversal of 21323220133 is 33102232312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21323220097) and next prime (21323220169).

It is a cyclic number.

It is not a de Polignac number, because 21323220133 - 2¹³ = 21323211941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323220433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535791 + ... + 1549612.

It is an arithmetic number, because the mean of its divisors is an integer number (5331578112).

Almost surely, 2^21323220133 is an apocalyptic number.

It is an amenable number.

21323220133 is a deficient number, since it is larger than the sum of its proper divisors (3092315).

21323220133 is an equidigital number, since it uses as much as digits as its factorization.

21323220133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092314.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21323220133 its reverse (33102232312), we get a palindrome (54425452445).

The spelling of 21323220133 in words is "twenty-one billion, three hundred twenty-three million, two hundred twenty thousand, one hundred thirty-three".