21020030233 has 2 divisors, whose sum is σ = 21020030234. Its totient is φ = 21020030232.

The previous prime is 21020030231. The next prime is 21020030243. The reversal of 21020030233 is 33203002012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20768268544 + 251761689 = 144112^2 + 15867^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020030233 - 2¹ = 21020030231 is a prime.

Together with 21020030231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21020030231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510015116 + 10510015117.

It is an arithmetic number, because the mean of its divisors is an integer number (10510015117).

Almost surely, 2^21020030233 is an apocalyptic number.

It is an amenable number.

21020030233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020030233 is an equidigital number, since it uses as much as digits as its factorization.

21020030233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21020030233 its reverse (33203002012), we get a palindrome (54223032245).

The spelling of 21020030233 in words is "twenty-one billion, twenty million, thirty thousand, two hundred thirty-three".