21203300353 has 4 divisors (see below), whose sum is σ = 21471696640. Its totient is φ = 20934904068.

The previous prime is 21203300351. The next prime is 21203300357. The reversal of 21203300353 is 35300330212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21203300353 - 2¹ = 21203300351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203300351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134198025 + ... + 134198182.

It is an arithmetic number, because the mean of its divisors is an integer number (5367924160).

Almost surely, 2^21203300353 is an apocalyptic number.

It is an amenable number.

21203300353 is a deficient number, since it is larger than the sum of its proper divisors (268396287).

21203300353 is an equidigital number, since it uses as much as digits as its factorization.

21203300353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268396286.

The product of its (nonzero) digits is 1620, while the sum is 22.

Adding to 21203300353 its reverse (35300330212), we get a palindrome (56503630565).

The spelling of 21203300353 in words is "twenty-one billion, two hundred three million, three hundred thousand, three hundred fifty-three".