211640650 has 96 divisors (see below), whose sum is σ = 455595840. Its totient is φ = 72453120.

The previous prime is 211640617. The next prime is 211640669. The reversal of 211640650 is 56046112.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 47 ways as a sum of consecutive naturals, for example, 1182261 + ... + 1182439.

It is an arithmetic number, because the mean of its divisors is an integer number (4745790).

Almost surely, 2^211640650 is an apocalyptic number.

211640650 is an abundant number, since it is smaller than the sum of its proper divisors (243955190).

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

211640650 is a wasteful number, since it uses less digits than its factorization.

211640650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 211640650 is about 14547.8744151852. The cubic root of 211640650 is about 595.9361015080.

Adding to 211640650 its reverse (56046112), we get a palindrome (267686762).

The spelling of 211640650 in words is "two hundred eleven million, six hundred forty thousand, six hundred fifty".