21000002203 has 8 divisors (see below), whose sum is σ = 21776000400. Its totient is φ = 20227461408.

The previous prime is 21000002201. The next prime is 21000002249. The reversal of 21000002203 is 30220000012.

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 21000002203 - 2¹ = 21000002201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000002203.

It is not an unprimeable number, because it can be changed into a prime (21000002201) 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 7 ways as a sum of consecutive naturals, for example, 851976 + ... + 876277.

It is an arithmetic number, because the mean of its divisors is an integer number (2722000050).

Almost surely, 2^21000002203 is an apocalyptic number.

21000002203 is a deficient number, since it is larger than the sum of its proper divisors (775998197).

21000002203 is a wasteful number, since it uses less digits than its factorization.

21000002203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728701.

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21000002203 its reverse (30220000012), we get a palindrome (51220002215).

The spelling of 21000002203 in words is "twenty-one billion, two thousand, two hundred three".