213521021333 has 2 divisors, whose sum is σ = 213521021334. Its totient is φ = 213521021332.

The previous prime is 213521021279. The next prime is 213521021347. The reversal of 213521021333 is 333120125312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145880455249 + 67640566084 = 381943^2 + 260078^2 .

It is a cyclic number.

It is not a de Polignac number, because 213521021333 - 2¹⁶ = 213520955797 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 (213521021353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106760510666 + 106760510667.

It is an arithmetic number, because the mean of its divisors is an integer number (106760510667).

Almost surely, 2^213521021333 is an apocalyptic number.

It is an amenable number.

213521021333 is a deficient number, since it is larger than the sum of its proper divisors (1).

213521021333 is an equidigital number, since it uses as much as digits as its factorization.

213521021333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 213521021333 its reverse (333120125312), we get a palindrome (546641146645).

The spelling of 213521021333 in words is "two hundred thirteen billion, five hundred twenty-one million, twenty-one thousand, three hundred thirty-three".