7213122 has 96 divisors (see below), whose sum is σ = 19768320. Its totient is φ = 1853280.

The previous prime is 7213097. The next prime is 7213123. The reversal of 7213122 is 2213127.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 7213095 and 7213104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7213123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54997 + ... + 55127.

It is an arithmetic number, because the mean of its divisors is an integer number (205920).

Almost surely, 2^7213122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7213122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9884160).

7213122 is an abundant number, since it is smaller than the sum of its proper divisors (12555198).

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

7213122 is a wasteful number, since it uses less digits than its factorization.

7213122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 185 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 7213122 is about 2685.7256002801. The cubic root of 7213122 is about 193.2151126894.

Adding to 7213122 its reverse (2213127), we get a palindrome (9426249).

It can be divided in two parts, 72 and 13122, that multiplied together give a square (944784 = 972²).

The spelling of 7213122 in words is "seven million, two hundred thirteen thousand, one hundred twenty-two".