211240040 has 32 divisors (see below), whose sum is σ = 518499360. Its totient is φ = 76814400.

The previous prime is 211240039. The next prime is 211240049. The reversal of 211240040 is 40042112.

It is a junction number, because it is equal to n+sod(n) for n = 211239997 and 211240024.

It is not an unprimeable number, because it can be changed into a prime (211240049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239606 + ... + 240485.

It is an arithmetic number, because the mean of its divisors is an integer number (16203105).

Almost surely, 2^211240040 is an apocalyptic number.

211240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211240040 is an abundant number, since it is smaller than the sum of its proper divisors (307259320).

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

211240040 is a wasteful number, since it uses less digits than its factorization.

211240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480113 (or 480109 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 211240040 is about 14534.0992152937. The cubic root of 211240040 is about 595.5598524995.

Adding to 211240040 its reverse (40042112), we get a palindrome (251282152).

The spelling of 211240040 in words is "two hundred eleven million, two hundred forty thousand, forty".