211900540 has 24 divisors (see below), whose sum is σ = 468412560. Its totient is φ = 80299008.

The previous prime is 211900511. The next prime is 211900567. The reversal of 211900540 is 45009112.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 278437 + ... + 279196.

It is an arithmetic number, because the mean of its divisors is an integer number (19517190).

Almost surely, 2^211900540 is an apocalyptic number.

211900540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211900540 is an abundant number, since it is smaller than the sum of its proper divisors (256512020).

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

211900540 is a wasteful number, since it uses less digits than its factorization.

211900540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557661 (or 557659 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 211900540 is about 14556.8039074517. The cubic root of 211900540 is about 596.1799338108.

Adding to 211900540 its reverse (45009112), we get a palindrome (256909652).

The spelling of 211900540 in words is "two hundred eleven million, nine hundred thousand, five hundred forty".