21250443402433 has 12 divisors (see below), whose sum is σ = 24759079344192. Its totient is φ = 18185799398760.

The previous prime is 21250443402431. The next prime is 21250443402451. The reversal of 21250443402433 is 33420434405212.

It is a happy number.

It is not a de Polignac number, because 21250443402433 - 2¹ = 21250443402431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21250443402392 and 21250443402401.

It is not an unprimeable number, because it can be changed into a prime (21250443402431) 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 in 11 ways as a sum of consecutive naturals, for example, 343616085 + ... + 343677922.

It is an arithmetic number, because the mean of its divisors is an integer number (2063256612016).

Almost surely, 2^{21250443402433} is an apocalyptic number.

It is an amenable number.

21250443402433 is a deficient number, since it is larger than the sum of its proper divisors (3508635941759).

21250443402433 is an equidigital number, since it uses as much as digits as its factorization.

21250443402433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687294652 (or 687294645 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 37.

Adding to 21250443402433 its reverse (33420434405212), we get a palindrome (54670877807645).

The spelling of 21250443402433 in words is "twenty-one trillion, two hundred fifty billion, four hundred forty-three million, four hundred two thousand, four hundred thirty-three".