21404402433 has 24 divisors (see below), whose sum is σ = 31092766848. Its totient is φ = 14188783392.

The previous prime is 21404402419. The next prime is 21404402441. The reversal of 21404402433 is 33420440412.

It is a happy number.

21404402433 is a `hidden beast` number, since 214 + 0 + 4 + 402 + 43 + 3 = 666.

It is not a de Polignac number, because 21404402433 - 2⁵ = 21404402401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21404402397 and 21404402406.

It is not an unprimeable number, because it can be changed into a prime (21404402413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4903710 + ... + 4908072.

It is an arithmetic number, because the mean of its divisors is an integer number (1295531952).

Almost surely, 2^21404402433 is an apocalyptic number.

It is an amenable number.

21404402433 is a deficient number, since it is larger than the sum of its proper divisors (9688364415).

21404402433 is a wasteful number, since it uses less digits than its factorization.

21404402433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333 (or 7330 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21404402433 its reverse (33420440412), we get a palindrome (54824842845).

The spelling of 21404402433 in words is "twenty-one billion, four hundred four million, four hundred two thousand, four hundred thirty-three".