7212217 has 4 divisors (see below), whose sum is σ = 7249780. Its totient is φ = 7174656.

The previous prime is 7212211. The next prime is 7212239. The reversal of 7212217 is 7122127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7122127 = 331 ⋅21517.

It can be written as a sum of positive squares in 2 ways, for example, as 3767481 + 3444736 = 1941^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 7212217 - 2³ = 7212209 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 18492 + ... + 18877.

It is an arithmetic number, because the mean of its divisors is an integer number (1812445).

Almost surely, 2^7212217 is an apocalyptic number.

It is an amenable number.

7212217 is a deficient number, since it is larger than the sum of its proper divisors (37563).

7212217 is a wasteful number, since it uses less digits than its factorization.

7212217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37562.

The product of its digits is 392, while the sum is 22.

The square root of 7212217 is about 2685.5571116623. The cubic root of 7212217 is about 193.2070317230.

The spelling of 7212217 in words is "seven million, two hundred twelve thousand, two hundred seventeen".