211240146 has 64 divisors (see below), whose sum is σ = 468292608. Its totient is φ = 63125568.

The previous prime is 211240121. The next prime is 211240151. The reversal of 211240146 is 641042112.

It is a happy number.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 433515 + ... + 434001.

It is an arithmetic number, because the mean of its divisors is an integer number (7317072).

Almost surely, 2^211240146 is an apocalyptic number.

211240146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 211240146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234146304).

211240146 is an abundant number, since it is smaller than the sum of its proper divisors (257052462).

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

211240146 is a wasteful number, since it uses less digits than its factorization.

211240146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 211240146 is about 14534.1028618900. The cubic root of 211240146 is about 595.5599521165.

Adding to 211240146 its reverse (641042112), we get a palindrome (852282258).

The spelling of 211240146 in words is "two hundred eleven million, two hundred forty thousand, one hundred forty-six".