21213020203 has 8 divisors (see below), whose sum is σ = 21535232256. Its totient is φ = 20893008000.

The previous prime is 21213020177. The next prime is 21213020207. The reversal of 21213020203 is 30202031212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213020203 - 2¹³ = 21213012011 is a prime.

It is a super-2 number, since 2×21213020203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213020207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530526 + ... + 569107.

It is an arithmetic number, because the mean of its divisors is an integer number (2691904032).

Almost surely, 2^21213020203 is an apocalyptic number.

21213020203 is a deficient number, since it is larger than the sum of its proper divisors (322212053).

21213020203 is a wasteful number, since it uses less digits than its factorization.

21213020203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099925.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21213020203 its reverse (30202031212), we get a palindrome (51415051415).

The spelling of 21213020203 in words is "twenty-one billion, two hundred thirteen million, twenty thousand, two hundred three".