21213200233 has 4 divisors (see below), whose sum is σ = 21613449348. Its totient is φ = 20812951120.

The previous prime is 21213200171. The next prime is 21213200249. The reversal of 21213200233 is 33200231212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19558581904 + 1654618329 = 139852^2 + 40677^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213200233 - 2¹⁷ = 21213069161 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 21213200233.

It is not an unprimeable number, because it can be changed into a prime (21213200033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200124478 + ... + 200124583.

It is an arithmetic number, because the mean of its divisors is an integer number (5403362337).

Almost surely, 2^21213200233 is an apocalyptic number.

It is an amenable number.

21213200233 is a deficient number, since it is larger than the sum of its proper divisors (400249115).

21213200233 is an equidigital number, since it uses as much as digits as its factorization.

21213200233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400249114.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21213200233 its reverse (33200231212), we get a palindrome (54413431445).

The spelling of 21213200233 in words is "twenty-one billion, two hundred thirteen million, two hundred thousand, two hundred thirty-three".