21003023233 has 2 divisors, whose sum is σ = 21003023234. Its totient is φ = 21003023232.

The previous prime is 21003023227. The next prime is 21003023257. The reversal of 21003023233 is 33232030012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19654077249 + 1348945984 = 140193^2 + 36728^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003023233 - 2¹⁷ = 21002892161 is a prime.

It is a super-2 number, since 2×21003023233² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003023233.

It is not a weakly prime, because it can be changed into another prime (21003023213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501511616 + 10501511617.

It is an arithmetic number, because the mean of its divisors is an integer number (10501511617).

Almost surely, 2^21003023233 is an apocalyptic number.

It is an amenable number.

21003023233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003023233 is an equidigital number, since it uses as much as digits as its factorization.

21003023233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21003023233 its reverse (33232030012), we get a palindrome (54235053245).

The spelling of 21003023233 in words is "twenty-one billion, three million, twenty-three thousand, two hundred thirty-three".