7121320 has 32 divisors (see below), whose sum is σ = 16542720. Its totient is φ = 2756160.

The previous prime is 7121267. The next prime is 7121321. The reversal of 7121320 is 231217.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7121294 and 7121303.

It is not an unprimeable number, because it can be changed into a prime (7121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (516960).

Almost surely, 2^7121320 is an apocalyptic number.

It is an amenable number.

7121320 is an abundant number, since it is smaller than the sum of its proper divisors (9421400).

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

7121320 is a wasteful number, since it uses less digits than its factorization.

7121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5785 (or 5781 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 7121320 is about 2668.5801468197. The cubic root of 7121320 is about 192.3919222407.

Adding to 7121320 its reverse (231217), we get a palindrome (7352537).

The spelling of 7121320 in words is "seven million, one hundred twenty-one thousand, three hundred twenty".