211055540 has 24 divisors (see below), whose sum is σ = 451581480. Its totient is φ = 82828928.

The previous prime is 211055539. The next prime is 211055623. The reversal of 211055540 is 45550112.

It is a happy number.

211055540 is digitally balanced in base 2, 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 4 ways, for example, as 48135844 + 162919696 = 6938^2 + 12764^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98495 + ... + 100614.

It is an arithmetic number, because the mean of its divisors is an integer number (18815895).

Almost surely, 2^211055540 is an apocalyptic number.

211055540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211055540 is an abundant number, since it is smaller than the sum of its proper divisors (240525940).

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

211055540 is a wasteful number, since it uses less digits than its factorization.

211055540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199171 (or 199169 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 211055540 is about 14527.7506861868. The cubic root of 211055540 is about 595.3864118980.

The spelling of 211055540 in words is "two hundred eleven million, fifty-five thousand, five hundred forty".