21002121222233 has 2 divisors, whose sum is σ = 21002121222234. Its totient is φ = 21002121222232.

The previous prime is 21002121222149. The next prime is 21002121222331. The reversal of 21002121222233 is 33222212120012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12830344310809 + 8171776911424 = 3581947^2 + 2858632^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002121222233 - 2¹² = 21002121218137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002121222199 and 21002121222208.

It is not a weakly prime, because it can be changed into another prime (21002121222133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501060611116 + 10501060611117.

It is an arithmetic number, because the mean of its divisors is an integer number (10501060611117).

Almost surely, 2^{21002121222233} is an apocalyptic number.

It is an amenable number.

21002121222233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002121222233 is an equidigital number, since it uses as much as digits as its factorization.

21002121222233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21002121222233 its reverse (33222212120012), we get a palindrome (54224333342245).

The spelling of 21002121222233 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-three".