211420645 has 4 divisors (see below), whose sum is σ = 253704780. Its totient is φ = 169136512.

The previous prime is 211420639. The next prime is 211420661. The reversal of 211420645 is 546024112.

It is a happy number.

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 151930276 + 59490369 = 12326^2 + 7713^2 .

It is a cyclic number.

It is not a de Polignac number, because 211420645 - 2⁵ = 211420613 is a prime.

It is a congruent number.

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, 21142060 + ... + 21142069.

It is an arithmetic number, because the mean of its divisors is an integer number (63426195).

Almost surely, 2^211420645 is an apocalyptic number.

It is an amenable number.

211420645 is a deficient number, since it is larger than the sum of its proper divisors (42284135).

211420645 is an equidigital number, since it uses as much as digits as its factorization.

211420645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42284134.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 211420645 is about 14540.3110351877. The cubic root of 211420645 is about 595.7295337898.

Adding to 211420645 its reverse (546024112), we get a palindrome (757444757).

The spelling of 211420645 in words is "two hundred eleven million, four hundred twenty thousand, six hundred forty-five".