21202402433 has 2 divisors, whose sum is σ = 21202402434. Its totient is φ = 21202402432.

The previous prime is 21202402381. The next prime is 21202402451. The reversal of 21202402433 is 33420420212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12150211984 + 9052190449 = 110228^2 + 95143^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202402433 - 2¹² = 21202398337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202402399 and 21202402408.

It is not a weakly prime, because it can be changed into another prime (21202402453) 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, 10601201216 + 10601201217.

It is an arithmetic number, because the mean of its divisors is an integer number (10601201217).

Almost surely, 2^21202402433 is an apocalyptic number.

It is an amenable number.

21202402433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202402433 is an equidigital number, since it uses as much as digits as its factorization.

21202402433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21202402433 its reverse (33420420212), we get a palindrome (54622822645).

The spelling of 21202402433 in words is "twenty-one billion, two hundred two million, four hundred two thousand, four hundred thirty-three".