211242140 has 12 divisors (see below), whose sum is σ = 443608536. Its totient is φ = 84496848.

The previous prime is 211242137. The next prime is 211242173. The reversal of 211242140 is 41242112.

211242140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5281034 + ... + 5281073.

It is an arithmetic number, because the mean of its divisors is an integer number (36967378).

Almost surely, 2^211242140 is an apocalyptic number.

211242140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211242140 is an abundant number, since it is smaller than the sum of its proper divisors (232366396).

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

211242140 is a wasteful number, since it uses less digits than its factorization.

211242140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562116 (or 10562114 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211242140 is about 14534.1714590134. The cubic root of 211242140 is about 595.5618260387.

Adding to 211242140 its reverse (41242112), we get a palindrome (252484252).

The spelling of 211242140 in words is "two hundred eleven million, two hundred forty-two thousand, one hundred forty".