21223356338 has 18 divisors (see below), whose sum is σ = 32905000287. Its totient is φ = 10266275580.

The previous prime is 21223356337. The next prime is 21223356347. The reversal of 21223356338 is 83365332212.

It can be written as a sum of positive squares in only one way, i.e., 10611678169 + 10611678169 = 103013^2 + 103013^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103013.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223356337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6385145 + ... + 6388467.

Almost surely, 2^21223356338 is an apocalyptic number.

21223356338 is a deficient number, since it is larger than the sum of its proper divisors (11681643949).

21223356338 is an frugal number, since it uses more digits than its factorization.

21223356338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710 (or 3356 counting only the distinct ones).

The product of its digits is 155520, while the sum is 38.

The spelling of 21223356338 in words is "twenty-one billion, two hundred twenty-three million, three hundred fifty-six thousand, three hundred thirty-eight".