211442140 has 48 divisors (see below), whose sum is σ = 546501312. Its totient is φ = 66917376.

The previous prime is 211442131. The next prime is 211442159. The reversal of 211442140 is 41244112.

211442140 = 5493² + 5494² + ... + 5499².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56269 + ... + 59908.

It is an arithmetic number, because the mean of its divisors is an integer number (11385444).

Almost surely, 2^211442140 is an apocalyptic number.

211442140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211442140 is an abundant number, since it is smaller than the sum of its proper divisors (335059172).

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

211442140 is a wasteful number, since it uses less digits than its factorization.

211442140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116206 (or 116204 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 211442140 is about 14541.0501684026. The cubic root of 211442140 is about 595.7497222509.

Adding to 211442140 its reverse (41244112), we get a palindrome (252686252).

The spelling of 211442140 in words is "two hundred eleven million, four hundred forty-two thousand, one hundred forty".