21275572433 has 2 divisors, whose sum is σ = 21275572434. Its totient is φ = 21275572432.

The previous prime is 21275572421. The next prime is 21275572463. The reversal of 21275572433 is 33427557212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10673369344 + 10602203089 = 103312^2 + 102967^2 .

It is a cyclic number.

It is not a de Polignac number, because 21275572433 - 2¹⁸ = 21275310289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21275572463) 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 as a sum of consecutive naturals, namely, 10637786216 + 10637786217.

It is an arithmetic number, because the mean of its divisors is an integer number (10637786217).

Almost surely, 2^21275572433 is an apocalyptic number.

It is an amenable number.

21275572433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21275572433 is an equidigital number, since it uses as much as digits as its factorization.

21275572433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 41.

The spelling of 21275572433 in words is "twenty-one billion, two hundred seventy-five million, five hundred seventy-two thousand, four hundred thirty-three".