211420609 has 4 divisors (see below), whose sum is σ = 211549104. Its totient is φ = 211292116.

The previous prime is 211420579. The next prime is 211420613. The reversal of 211420609 is 906024112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211420609 - 2⁷ = 211420481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211420639) 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, 61747 + ... + 65080.

It is an arithmetic number, because the mean of its divisors is an integer number (52887276).

Almost surely, 2^211420609 is an apocalyptic number.

It is an amenable number.

211420609 is a deficient number, since it is larger than the sum of its proper divisors (128495).

211420609 is a wasteful number, since it uses less digits than its factorization.

211420609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128494.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 211420609 is about 14540.3097972499. The cubic root of 211420609 is about 595.7294999769.

The spelling of 211420609 in words is "two hundred eleven million, four hundred twenty thousand, six hundred nine".