21020400012233 has 2 divisors, whose sum is σ = 21020400012234. Its totient is φ = 21020400012232.

The previous prime is 21020400012229. The next prime is 21020400012247. The reversal of 21020400012233 is 33221000402012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14848290809104 + 6172109203129 = 3853348^2 + 2484373^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020400012233 - 2² = 21020400012229 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020400012263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510200006116 + 10510200006117.

It is an arithmetic number, because the mean of its divisors is an integer number (10510200006117).

Almost surely, 2^{21020400012233} is an apocalyptic number.

It is an amenable number.

21020400012233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020400012233 is an equidigital number, since it uses as much as digits as its factorization.

21020400012233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21020400012233 its reverse (33221000402012), we get a palindrome (54241400414245).

The spelling of 21020400012233 in words is "twenty-one trillion, twenty billion, four hundred million, twelve thousand, two hundred thirty-three".