21012011010233 has 2 divisors, whose sum is σ = 21012011010234. Its totient is φ = 21012011010232.

The previous prime is 21012011010083. The next prime is 21012011010247. The reversal of 21012011010233 is 33201011021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12502468589689 + 8509542420544 = 3535883^2 + 2917112^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012011010233 - 2¹⁶ = 21012010944697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012011010253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506005505116 + 10506005505117.

It is an arithmetic number, because the mean of its divisors is an integer number (10506005505117).

Almost surely, 2^{21012011010233} is an apocalyptic number.

It is an amenable number.

21012011010233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012011010233 is an equidigital number, since it uses as much as digits as its factorization.

21012011010233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21012011010233 its reverse (33201011021012), we get a palindrome (54213022031245).

The spelling of 21012011010233 in words is "twenty-one trillion, twelve billion, eleven million, ten thousand, two hundred thirty-three".