21332023133 has 4 divisors (see below), whose sum is σ = 21336905628. Its totient is φ = 21327140640.

The previous prime is 21332023129. The next prime is 21332023157. The reversal of 21332023133 is 33132023312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15207082489 + 6124940644 = 123317^2 + 78262^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332023133 - 2² = 21332023129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21332023099 and 21332023108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332023103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2434688 + ... + 2443433.

It is an arithmetic number, because the mean of its divisors is an integer number (5334226407).

Almost surely, 2^21332023133 is an apocalyptic number.

It is an amenable number.

21332023133 is a deficient number, since it is larger than the sum of its proper divisors (4882495).

21332023133 is an equidigital number, since it uses as much as digits as its factorization.

21332023133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882494.

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

Adding to 21332023133 its reverse (33132023312), we get a palindrome (54464046445).

The spelling of 21332023133 in words is "twenty-one billion, three hundred thirty-two million, twenty-three thousand, one hundred thirty-three".