7212137 has 4 divisors (see below), whose sum is σ = 7233876. Its totient is φ = 7190400.

The previous prime is 7212083. The next prime is 7212157. The reversal of 7212137 is 7312127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1731856 + 5480281 = 1316^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 7212137 - 2¹⁴ = 7195753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7212157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10364 + ... + 11037.

It is an arithmetic number, because the mean of its divisors is an integer number (1808469).

Almost surely, 2^7212137 is an apocalyptic number.

It is an amenable number.

7212137 is a deficient number, since it is larger than the sum of its proper divisors (21739).

7212137 is a wasteful number, since it uses less digits than its factorization.

7212137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21738.

The product of its digits is 588, while the sum is 23.

The square root of 7212137 is about 2685.5422171323. The cubic root of 7212137 is about 193.2063173509.

The spelling of 7212137 in words is "seven million, two hundred twelve thousand, one hundred thirty-seven".