213803587321 has 9 divisors (see below), whose sum is σ = 219755822349. Its totient is φ = 208008465984.

The previous prime is 213803587271. The next prime is 213803587331. The reversal of 213803587321 is 123785308312.

It is a happy number.

The square root of 213803587321 is 462389.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 47257977321 + 166545610000 = 217389^2 + 408100^2 .

It is not a de Polignac number, because 213803587321 - 2²⁹ = 213266716409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213803587331) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17102145 + ... + 17114641.

Almost surely, 2^213803587321 is an apocalyptic number.

213803587321 is the 462389-th square number.

213803587321 is the 231195-th centered octagonal number.

It is an amenable number.

213803587321 is a deficient number, since it is larger than the sum of its proper divisors (5952235028).

213803587321 is an frugal number, since it uses more digits than its factorization.

213803587321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25068 (or 12534 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 213803587321 in words is "two hundred thirteen billion, eight hundred three million, five hundred eighty-seven thousand, three hundred twenty-one".