213521021335 has 4 divisors (see below), whose sum is σ = 256225225608. Its totient is φ = 170816817064.

The previous prime is 213521021333. The next prime is 213521021347. The reversal of 213521021335 is 533120125312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213521021335 - 2¹ = 213521021333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213521021333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21352102129 + ... + 21352102138.

It is an arithmetic number, because the mean of its divisors is an integer number (64056306402).

Almost surely, 2^213521021335 is an apocalyptic number.

213521021335 is a deficient number, since it is larger than the sum of its proper divisors (42704204273).

213521021335 is an equidigital number, since it uses as much as digits as its factorization.

213521021335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42704204272.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 213521021335 its reverse (533120125312), we get a palindrome (746641146647).

The spelling of 213521021335 in words is "two hundred thirteen billion, five hundred twenty-one million, twenty-one thousand, three hundred thirty-five".