213532252321 has 4 divisors (see below), whose sum is σ = 213757736112. Its totient is φ = 213306768532.

The previous prime is 213532252253. The next prime is 213532252357. The reversal of 213532252321 is 123252235312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213532252321 - 2¹⁷ = 213532121249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213532252391) 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, 112740475 + ... + 112742368.

It is an arithmetic number, because the mean of its divisors is an integer number (53439434028).

Almost surely, 2^213532252321 is an apocalyptic number.

It is an amenable number.

213532252321 is a deficient number, since it is larger than the sum of its proper divisors (225483791).

213532252321 is an equidigital number, since it uses as much as digits as its factorization.

213532252321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225483790.

The product of its digits is 21600, while the sum is 31.

Adding to 213532252321 its reverse (123252235312), we get a palindrome (336784487633).

The spelling of 213532252321 in words is "two hundred thirteen billion, five hundred thirty-two million, two hundred fifty-two thousand, three hundred twenty-one".