21802464133 has 4 divisors (see below), whose sum is σ = 21802780908. Its totient is φ = 21802147360.

The previous prime is 21802464121. The next prime is 21802464139. The reversal of 21802464133 is 33146420812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20173373089 + 1629091044 = 142033^2 + 40362^2 .

It is a cyclic number.

It is not a de Polignac number, because 21802464133 - 2²¹ = 21800366981 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 (21802464139) 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, 6766 + ... + 208927.

It is an arithmetic number, because the mean of its divisors is an integer number (5450695227).

Almost surely, 2^21802464133 is an apocalyptic number.

It is an amenable number.

21802464133 is a deficient number, since it is larger than the sum of its proper divisors (316775).

21802464133 is a wasteful number, since it uses less digits than its factorization.

21802464133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316774.

The product of its (nonzero) digits is 27648, while the sum is 34.

Adding to 21802464133 its reverse (33146420812), we get a palindrome (54948884945).

The spelling of 21802464133 in words is "twenty-one billion, eight hundred two million, four hundred sixty-four thousand, one hundred thirty-three".