21221020233233 has 2 divisors, whose sum is σ = 21221020233234. Its totient is φ = 21221020233232.

The previous prime is 21221020233167. The next prime is 21221020233253. The reversal of 21221020233233 is 33233202012212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19422556852609 + 1798463380624 = 4407103^2 + 1341068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221020233233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221020233253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510116616 + 10610510116617.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510116617).

Almost surely, 2^{21221020233233} is an apocalyptic number.

It is an amenable number.

21221020233233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020233233 is an equidigital number, since it uses as much as digits as its factorization.

21221020233233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21221020233233 its reverse (33233202012212), we get a palindrome (54454222245445).

The spelling of 21221020233233 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-three thousand, two hundred thirty-three".