211403540 has 12 divisors (see below), whose sum is σ = 443947476. Its totient is φ = 84561408.

The previous prime is 211403531. The next prime is 211403567. The reversal of 211403540 is 45304112.

211403540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104611984 + 106791556 = 10228^2 + 10334^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10570177 = 211403540 / (2 + 1 + 1 + 4 + 0 + 3 + 5 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5285069 + ... + 5285108.

It is an arithmetic number, because the mean of its divisors is an integer number (36995623).

Almost surely, 2^211403540 is an apocalyptic number.

211403540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211403540 is an abundant number, since it is smaller than the sum of its proper divisors (232543936).

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

211403540 is a wasteful number, since it uses less digits than its factorization.

211403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10570186 (or 10570184 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 211403540 is about 14539.7228309208. The cubic root of 211403540 is about 595.7134675120.

Adding to 211403540 its reverse (45304112), we get a palindrome (256707652).

The spelling of 211403540 in words is "two hundred eleven million, four hundred three thousand, five hundred forty".