21112101233 has 2 divisors, whose sum is σ = 21112101234. Its totient is φ = 21112101232.

The previous prime is 21112101223. The next prime is 21112101299. The reversal of 21112101233 is 33210121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20965012849 + 147088384 = 144793^2 + 12128^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112101233 - 2⁴ = 21112101217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112101203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556050616 + 10556050617.

It is an arithmetic number, because the mean of its divisors is an integer number (10556050617).

Almost surely, 2^21112101233 is an apocalyptic number.

It is an amenable number.

21112101233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112101233 is an equidigital number, since it uses as much as digits as its factorization.

21112101233 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 21112101233 its reverse (33210121112), we get a palindrome (54322222345).

The spelling of 21112101233 in words is "twenty-one billion, one hundred twelve million, one hundred one thousand, two hundred thirty-three".