211205040 has 40 divisors (see below), whose sum is σ = 654736368. Its totient is φ = 56321280.

The previous prime is 211205011. The next prime is 211205041. The reversal of 211205040 is 40502112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (211205041) 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, 439771 + ... + 440250.

Almost surely, 2^211205040 is an apocalyptic number.

211205040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211205040 is an abundant number, since it is smaller than the sum of its proper divisors (443531328).

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

211205040 is a wasteful number, since it uses less digits than its factorization.

211205040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880037 (or 880031 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 211205040 is about 14532.8951004265. The cubic root of 211205040 is about 595.5269582524.

Adding to 211205040 its reverse (40502112), we get a palindrome (251707152).

The spelling of 211205040 in words is "two hundred eleven million, two hundred five thousand, forty".