211313840 has 20 divisors (see below), whose sum is σ = 491304864. Its totient is φ = 84525504.

The previous prime is 211313827. The next prime is 211313849. The reversal of 211313840 is 48313112.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (211313849) 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, 1320632 + ... + 1320791.

Almost surely, 2^211313840 is an apocalyptic number.

211313840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211313840 is an abundant number, since it is smaller than the sum of its proper divisors (279991024).

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

211313840 is a wasteful number, since it uses less digits than its factorization.

211313840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641436 (or 2641430 counting only the distinct ones).

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

The square root of 211313840 is about 14536.6378506173. The cubic root of 211313840 is about 595.6292004628.

Adding to 211313840 its reverse (48313112), we get a palindrome (259626952).

The spelling of 211313840 in words is "two hundred eleven million, three hundred thirteen thousand, eight hundred forty".