7212218 has 16 divisors (see below), whose sum is σ = 11923296. Its totient is φ = 3250800.

The previous prime is 7212211. The next prime is 7212239. The reversal of 7212218 is 8122127.

It is a junction number, because it is equal to n+sod(n) for n = 7212193 and 7212202.

It is not an unprimeable number, because it can be changed into a prime (7212211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108 + ... + 4343.

It is an arithmetic number, because the mean of its divisors is an integer number (745206).

Almost surely, 2^7212218 is an apocalyptic number.

7212218 is a deficient number, since it is larger than the sum of its proper divisors (4711078).

7212218 is a wasteful number, since it uses less digits than its factorization.

7212218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509.

The product of its digits is 448, while the sum is 23.

The square root of 7212218 is about 2685.5572978434. The cubic root of 7212218 is about 193.2070406526.

Subtracting 7212218 from its reverse (8122127), we obtain a palindrome (909909).

The spelling of 7212218 in words is "seven million, two hundred twelve thousand, two hundred eighteen".