21213220211203 has 4 divisors (see below), whose sum is σ = 21247490357560. Its totient is φ = 21178950064848.

The previous prime is 21213220211147. The next prime is 21213220211207. The reversal of 21213220211203 is 30211202231212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21213220211203 - 2⁹ = 21213220210691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213220211207) 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 3 ways as a sum of consecutive naturals, for example, 17135072250 + ... + 17135073487.

It is an arithmetic number, because the mean of its divisors is an integer number (5311872589390).

Almost surely, 2^{21213220211203} is an apocalyptic number.

21213220211203 is a deficient number, since it is larger than the sum of its proper divisors (34270146357).

21213220211203 is an equidigital number, since it uses as much as digits as its factorization.

21213220211203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34270146356.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21213220211203 its reverse (30211202231212), we get a palindrome (51424422442415).

The spelling of 21213220211203 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty million, two hundred eleven thousand, two hundred three".