21140323033 has 4 divisors (see below), whose sum is σ = 21142512820. Its totient is φ = 21138133248.

The previous prime is 21140323031. The next prime is 21140323037. The reversal of 21140323033 is 33032304112.

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 4568137744 + 16572185289 = 67588^2 + 128733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140323033 - 2¹ = 21140323031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140322995 and 21140323013.

It is not an unprimeable number, because it can be changed into a prime (21140323031) 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, 1080348 + ... + 1099741.

It is an arithmetic number, because the mean of its divisors is an integer number (5285628205).

Almost surely, 2^21140323033 is an apocalyptic number.

It is an amenable number.

21140323033 is a deficient number, since it is larger than the sum of its proper divisors (2189787).

21140323033 is an equidigital number, since it uses as much as digits as its factorization.

21140323033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189786.

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

Adding to 21140323033 its reverse (33032304112), we get a palindrome (54172627145).

The spelling of 21140323033 in words is "twenty-one billion, one hundred forty million, three hundred twenty-three thousand, thirty-three".