16212145 has 4 divisors (see below), whose sum is σ = 19454580. Its totient is φ = 12969712.

The previous prime is 16212139. The next prime is 16212173. The reversal of 16212145 is 54121261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54121261 = 3121 ⋅17341.

It can be written as a sum of positive squares in 2 ways, for example, as 3701776 + 12510369 = 1924^2 + 3537^2 .

It is a cyclic number.

It is not a de Polignac number, because 16212145 - 2³ = 16212137 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1621210 + ... + 1621219.

It is an arithmetic number, because the mean of its divisors is an integer number (4863645).

Almost surely, 2^16212145 is an apocalyptic number.

It is an amenable number.

16212145 is a deficient number, since it is larger than the sum of its proper divisors (3242435).

16212145 is an equidigital number, since it uses as much as digits as its factorization.

16212145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242434.

The product of its digits is 480, while the sum is 22.

The square root of 16212145 is about 4026.4308015909. The cubic root of 16212145 is about 253.0930152138.

The spelling of 16212145 in words is "sixteen million, two hundred twelve thousand, one hundred forty-five".