211125540 has 24 divisors (see below), whose sum is σ = 591151680. Its totient is φ = 56300128.

The previous prime is 211125517. The next prime is 211125569. The reversal of 211125540 is 45521112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1759320 + ... + 1759439.

It is an arithmetic number, because the mean of its divisors is an integer number (24631320).

Almost surely, 2^211125540 is an apocalyptic number.

211125540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211125540 is an abundant number, since it is smaller than the sum of its proper divisors (380026140).

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

211125540 is a wasteful number, since it uses less digits than its factorization.

211125540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518771 (or 3518769 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 211125540 is about 14530.1596687717. The cubic root of 211125540 is about 595.4522278155.

Adding to 211125540 its reverse (45521112), we get a palindrome (256646652).

It can be divided in two parts, 211 and 125540, that added together give a triangular number (125751 = T₅₀₁).

The spelling of 211125540 in words is "two hundred eleven million, one hundred twenty-five thousand, five hundred forty".