21101010233 has 2 divisors, whose sum is σ = 21101010234. Its totient is φ = 21101010232.

The previous prime is 21101010211. The next prime is 21101010239. The reversal of 21101010233 is 33201010112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20744064784 + 356945449 = 144028^2 + 18893^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101010233 - 2⁶ = 21101010169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101010239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550505116 + 10550505117.

It is an arithmetic number, because the mean of its divisors is an integer number (10550505117).

Almost surely, 2^21101010233 is an apocalyptic number.

It is an amenable number.

21101010233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101010233 is an equidigital number, since it uses as much as digits as its factorization.

21101010233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21101010233 its reverse (33201010112), we get a palindrome (54302020345).

The spelling of 21101010233 in words is "twenty-one billion, one hundred one million, ten thousand, two hundred thirty-three".