21203220203 has 16 divisors (see below), whose sum is σ = 23498573280. Its totient is φ = 18971366400.

The previous prime is 21203220187. The next prime is 21203220211. The reversal of 21203220203 is 30202230212.

It is a cyclic number.

It is not a de Polignac number, because 21203220203 - 2⁴ = 21203220187 is a prime.

It is a super-2 number, since 2×21203220203² (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 (21203220253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138233 + ... + 248021.

It is an arithmetic number, because the mean of its divisors is an integer number (1468660830).

Almost surely, 2^21203220203 is an apocalyptic number.

21203220203 is a deficient number, since it is larger than the sum of its proper divisors (2295353077).

21203220203 is a wasteful number, since it uses less digits than its factorization.

21203220203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110078.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21203220203 its reverse (30202230212), we get a palindrome (51405450415).

The spelling of 21203220203 in words is "twenty-one billion, two hundred three million, two hundred twenty thousand, two hundred three".