21203224017 has 8 divisors (see below), whose sum is σ = 28301140896. Its totient is φ = 14120394912.

The previous prime is 21203224001. The next prime is 21203224037. The reversal of 21203224017 is 71042230212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21203224017 - 2⁴ = 21203224001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203224037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3768663 + ... + 3774284.

It is an arithmetic number, because the mean of its divisors is an integer number (3537642612).

Almost surely, 2^21203224017 is an apocalyptic number.

It is an amenable number.

21203224017 is a deficient number, since it is larger than the sum of its proper divisors (7097916879).

21203224017 is an equidigital number, since it uses as much as digits as its factorization.

21203224017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7543887.

The product of its (nonzero) digits is 1344, while the sum is 24.

Adding to 21203224017 its reverse (71042230212), we get a palindrome (92245454229).

The spelling of 21203224017 in words is "twenty-one billion, two hundred three million, two hundred twenty-four thousand, seventeen".