21001020012233 has 2 divisors, whose sum is σ = 21001020012234. Its totient is φ = 21001020012232.

The previous prime is 21001020012211. The next prime is 21001020012257. The reversal of 21001020012233 is 33221002010012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16020142335289 + 4980877676944 = 4002517^2 + 2231788^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001020012233 - 2⁸ = 21001020011977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001020012263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500510006116 + 10500510006117.

It is an arithmetic number, because the mean of its divisors is an integer number (10500510006117).

Almost surely, 2^{21001020012233} is an apocalyptic number.

It is an amenable number.

21001020012233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001020012233 is an equidigital number, since it uses as much as digits as its factorization.

21001020012233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21001020012233 its reverse (33221002010012), we get a palindrome (54222022022245).

The spelling of 21001020012233 in words is "twenty-one trillion, one billion, twenty million, twelve thousand, two hundred thirty-three".