7121220 has 24 divisors (see below), whose sum is σ = 19939584. Its totient is φ = 1898976.

The previous prime is 7121209. The next prime is 7121263. The reversal of 7121220 is 221217.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 7121220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59284 + ... + 59403.

It is an arithmetic number, because the mean of its divisors is an integer number (830816).

Almost surely, 2^7121220 is an apocalyptic number.

It is an amenable number.

7121220 is an abundant number, since it is smaller than the sum of its proper divisors (12818364).

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

7121220 is a wasteful number, since it uses less digits than its factorization.

7121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118699 (or 118697 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 7121220 is about 2668.5614101984. The cubic root of 7121220 is about 192.3910216922.

Adding to 7121220 its reverse (221217), we get a palindrome (7342437).

The spelling of 7121220 in words is "seven million, one hundred twenty-one thousand, two hundred twenty".