21221023203 has 12 divisors (see below), whose sum is σ = 30667857688. Its totient is φ = 14140301760.

The previous prime is 21221023199. The next prime is 21221023237. The reversal of 21221023203 is 30232012212.

It is not a de Polignac number, because 21221023203 - 2² = 21221023199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221023273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568150 + ... + 604347.

Almost surely, 2^21221023203 is an apocalyptic number.

21221023203 is a deficient number, since it is larger than the sum of its proper divisors (9446834485).

21221023203 is a wasteful number, since it uses less digits than its factorization.

21221023203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174514 (or 1174511 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21221023203 its reverse (30232012212), we get a palindrome (51453035415).

The spelling of 21221023203 in words is "twenty-one billion, two hundred twenty-one million, twenty-three thousand, two hundred three".