21304054433 has 2 divisors, whose sum is σ = 21304054434. Its totient is φ = 21304054432.

The previous prime is 21304054427. The next prime is 21304054477. The reversal of 21304054433 is 33445040312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21224701969 + 79352464 = 145687^2 + 8908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304054433 - 2²⁴ = 21287277217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21304054396 and 21304054405.

It is not a weakly prime, because it can be changed into another prime (21304059433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652027216 + 10652027217.

It is an arithmetic number, because the mean of its divisors is an integer number (10652027217).

Almost surely, 2^21304054433 is an apocalyptic number.

It is an amenable number.

21304054433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304054433 is an equidigital number, since it uses as much as digits as its factorization.

21304054433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21304054433 its reverse (33445040312), we get a palindrome (54749094745).

The spelling of 21304054433 in words is "twenty-one billion, three hundred four million, fifty-four thousand, four hundred thirty-three".