211206380 has 48 divisors (see below), whose sum is σ = 552980736. Its totient is φ = 65830080.

The previous prime is 211206367. The next prime is 211206389. The reversal of 211206380 is 83602112.

It is not an unprimeable number, because it can be changed into a prime (211206389) 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 15 ways as a sum of consecutive naturals, for example, 67034 + ... + 70113.

It is an arithmetic number, because the mean of its divisors is an integer number (11520432).

Almost surely, 2^211206380 is an apocalyptic number.

211206380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211206380 is an abundant number, since it is smaller than the sum of its proper divisors (341774356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211206380 is a wasteful number, since it uses less digits than its factorization.

211206380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137174 (or 137172 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 211206380 is about 14532.9412026609. The cubic root of 211206380 is about 595.5282176991.

Adding to 211206380 its reverse (83602112), we get a palindrome (294808492).

The spelling of 211206380 in words is "two hundred eleven million, two hundred six thousand, three hundred eighty".