211252109 has 4 divisors (see below), whose sum is σ = 211290204. Its totient is φ = 211214016.

The previous prime is 211252087. The next prime is 211252123. The reversal of 211252109 is 901252112.

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 133864900 + 77387209 = 11570^2 + 8797^2 .

It is a cyclic number.

It is not a de Polignac number, because 211252109 - 2¹² = 211248013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211252609) 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, 8942 + ... + 22415.

It is an arithmetic number, because the mean of its divisors is an integer number (52822551).

Almost surely, 2^211252109 is an apocalyptic number.

It is an amenable number.

211252109 is a deficient number, since it is larger than the sum of its proper divisors (38095).

211252109 is an equidigital number, since it uses as much as digits as its factorization.

211252109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38094.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 211252109 is about 14534.5144053732. The cubic root of 211252109 is about 595.5711945332.

The spelling of 211252109 in words is "two hundred eleven million, two hundred fifty-two thousand, one hundred nine".