213321504 has 96 divisors (see below), whose sum is σ = 637507584. Its totient is φ = 61825280.

The previous prime is 213321499. The next prime is 213321517. The reversal of 213321504 is 405123312.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19897 + ... + 28679.

It is an arithmetic number, because the mean of its divisors is an integer number (6640704).

Almost surely, 2^213321504 is an apocalyptic number.

213321504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213321504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318753792).

213321504 is an abundant number, since it is smaller than the sum of its proper divisors (424186080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213321504 is a wasteful number, since it uses less digits than its factorization.

213321504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8830 (or 8822 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 213321504 is about 14605.5299116465. The cubic root of 213321504 is about 597.5095884971.

Adding to 213321504 its reverse (405123312), we get a palindrome (618444816).

The spelling of 213321504 in words is "two hundred thirteen million, three hundred twenty-one thousand, five hundred four".