7221042 has 16 divisors (see below), whose sum is σ = 16046880. Its totient is φ = 2406996.

The previous prime is 7221041. The next prime is 7221077. The reversal of 7221042 is 2401227.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (7221041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66808 + ... + 66915.

It is an arithmetic number, because the mean of its divisors is an integer number (1002930).

Almost surely, 2^7221042 is an apocalyptic number.

7221042 is an abundant number, since it is smaller than the sum of its proper divisors (8825838).

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

7221042 is a wasteful number, since it uses less digits than its factorization.

7221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133734 (or 133728 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 7221042 is about 2687.1996576362. The cubic root of 7221042 is about 193.2858034832.

Adding to 7221042 its reverse (2401227), we get a palindrome (9622269).

It can be divided in two parts, 722 and 1042, that added together give a square (1764 = 42²).

The spelling of 7221042 in words is "seven million, two hundred twenty-one thousand, forty-two".