21213221203 has 8 divisors (see below), whose sum is σ = 21264629760. Its totient is φ = 21161872200.

The previous prime is 21213221191. The next prime is 21213221273. The reversal of 21213221203 is 30212231212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213221273) 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, 744526 + ... + 772492.

It is an arithmetic number, because the mean of its divisors is an integer number (2658078720).

Almost surely, 2^21213221203 is an apocalyptic number.

21213221203 is a deficient number, since it is larger than the sum of its proper divisors (51408557).

21213221203 is a wasteful number, since it uses less digits than its factorization.

21213221203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29777.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21213221203 its reverse (30212231212), we get a palindrome (51425452415).

The spelling of 21213221203 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred three".