21233533253 has 2 divisors, whose sum is σ = 21233533254. Its totient is φ = 21233533252.

The previous prime is 21233533219. The next prime is 21233533271. The reversal of 21233533253 is 35233533212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21008473249 + 225060004 = 144943^2 + 15002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233533253 - 2¹⁴ = 21233516869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233533283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616766626 + 10616766627.

It is an arithmetic number, because the mean of its divisors is an integer number (10616766627).

Almost surely, 2^21233533253 is an apocalyptic number.

It is an amenable number.

21233533253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233533253 is an equidigital number, since it uses as much as digits as its factorization.

21233533253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 32.

The spelling of 21233533253 in words is "twenty-one billion, two hundred thirty-three million, five hundred thirty-three thousand, two hundred fifty-three".