211253440 has 28 divisors (see below), whose sum is σ = 503048016. Its totient is φ = 84501248.

The previous prime is 211253423. The next prime is 211253447. The reversal of 211253440 is 44352112.

It is not an unprimeable number, because it can be changed into a prime (211253447) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 329764 + ... + 330403.

Almost surely, 2^211253440 is an apocalyptic number.

211253440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211253440 is an abundant number, since it is smaller than the sum of its proper divisors (291794576).

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

211253440 is an equidigital number, since it uses as much as digits as its factorization.

211253440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660184 (or 660174 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 211253440 is about 14534.5601928645. The cubic root of 211253440 is about 595.5724453351.

The spelling of 211253440 in words is "two hundred eleven million, two hundred fifty-three thousand, four hundred forty".