21325303443 has 16 divisors (see below), whose sum is σ = 28721511936. Its totient is φ = 14073095040.

The previous prime is 21325303423. The next prime is 21325303459. The reversal of 21325303443 is 34430352312.

It is not a de Polignac number, because 21325303443 - 2¹⁷ = 21325172371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21325303443.

It is not an unprimeable number, because it can be changed into a prime (21325303423) 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 15 ways as a sum of consecutive naturals, for example, 824971 + ... + 850427.

It is an arithmetic number, because the mean of its divisors is an integer number (1795094496).

Almost surely, 2^21325303443 is an apocalyptic number.

21325303443 is a deficient number, since it is larger than the sum of its proper divisors (7396208493).

21325303443 is a wasteful number, since it uses less digits than its factorization.

21325303443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28274.

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21325303443 its reverse (34430352312), we get a palindrome (55755655755).

The spelling of 21325303443 in words is "twenty-one billion, three hundred twenty-five million, three hundred three thousand, four hundred forty-three".