7213405321 has 8 divisors (see below), whose sum is σ = 7282747584. Its totient is φ = 7144098960.

The previous prime is 7213405319. The next prime is 7213405327. The reversal of 7213405321 is 1235043127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7213405321 - 2¹ = 7213405319 is a prime.

It is a super-2 number, since 2×7213405321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7213405321.

It is not an unprimeable number, because it can be changed into a prime (7213405327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574911 + ... + 587323.

It is an arithmetic number, because the mean of its divisors is an integer number (910343448).

Almost surely, 2^7213405321 is an apocalyptic number.

It is an amenable number.

7213405321 is a deficient number, since it is larger than the sum of its proper divisors (69342263).

7213405321 is a wasteful number, since it uses less digits than its factorization.

7213405321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17951.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 7213405321 is about 84931.7686204638. The cubic root of 7213405321 is about 1932.1764239305.

Adding to 7213405321 its reverse (1235043127), we get a palindrome (8448448448).

The spelling of 7213405321 in words is "seven billion, two hundred thirteen million, four hundred five thousand, three hundred twenty-one".