21320220203 has 16 divisors (see below), whose sum is σ = 22454003520. Its totient is φ = 20215448064.

The previous prime is 21320220197. The next prime is 21320220223. The reversal of 21320220203 is 30202202312.

It is not a de Polignac number, because 21320220203 - 2³⁰ = 20246478379 is a prime.

It is a super-2 number, since 2×21320220203² (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 (21320220223) 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, 471650 + ... + 514872.

It is an arithmetic number, because the mean of its divisors is an integer number (1403375220).

Almost surely, 2^21320220203 is an apocalyptic number.

21320220203 is a deficient number, since it is larger than the sum of its proper divisors (1133783317).

21320220203 is a wasteful number, since it uses less digits than its factorization.

21320220203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43558.

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

Adding to 21320220203 its reverse (30202202312), we get a palindrome (51522422515).

The spelling of 21320220203 in words is "twenty-one billion, three hundred twenty million, two hundred twenty thousand, two hundred three".