212907 has 4 divisors (see below), whose sum is σ = 283880. Its totient is φ = 141936.

The previous prime is 212903. The next prime is 212909. The reversal of 212907 is 709212.

212907 = T₂₁₃ + T₂₁₄ + ... + T₂₂₁.

It is a happy number.

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

It is not a de Polignac number, because 212907 - 2² = 212903 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

212907 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (212903) by changing a digit.

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, 35482 + ... + 35487.

It is an arithmetic number, because the mean of its divisors is an integer number (70970).

2²¹²⁹⁰⁷ is an apocalyptic number.

212907 is a deficient number, since it is larger than the sum of its proper divisors (70973).

212907 is an equidigital number, since it uses as much as digits as its factorization.

212907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70972.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 212907 is about 461.4184651702. The cubic root of 212907 is about 59.7122331550.

The spelling of 212907 in words is "two hundred twelve thousand, nine hundred seven".