211530140 has 12 divisors (see below), whose sum is σ = 444213336. Its totient is φ = 84612048.

The previous prime is 211530139. The next prime is 211530157. The reversal of 211530140 is 41035112.

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, 5288234 + ... + 5288273.

It is an arithmetic number, because the mean of its divisors is an integer number (37017778).

Almost surely, 2^211530140 is an apocalyptic number.

211530140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211530140 is an abundant number, since it is smaller than the sum of its proper divisors (232683196).

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

211530140 is a wasteful number, since it uses less digits than its factorization.

211530140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576516 (or 10576514 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 211530140 is about 14544.0757698796. The cubic root of 211530140 is about 595.8323590488.

Adding to 211530140 its reverse (41035112), we get a palindrome (252565252).

The spelling of 211530140 in words is "two hundred eleven million, five hundred thirty thousand, one hundred forty".