211224540 has 48 divisors (see below), whose sum is σ = 592083072. Its totient is φ = 56264256.

The previous prime is 211224511. The next prime is 211224553. The reversal of 211224540 is 45422112.

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, 84387 + ... + 86853.

It is an arithmetic number, because the mean of its divisors is an integer number (12335064).

Almost surely, 2^211224540 is an apocalyptic number.

211224540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211224540 is an abundant number, since it is smaller than the sum of its proper divisors (380858532).

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

211224540 is a wasteful number, since it uses less digits than its factorization.

211224540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906 (or 3904 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 211224540 is about 14533.5659767312. The cubic root of 211224540 is about 595.5452854955.

Adding to 211224540 its reverse (45422112), we get a palindrome (256646652).

The spelling of 211224540 in words is "two hundred eleven million, two hundred twenty-four thousand, five hundred forty".