211145240 has 32 divisors (see below), whose sum is σ = 479526480. Its totient is φ = 83667072.

The previous prime is 211145239. The next prime is 211145243. The reversal of 211145240 is 42541112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211145243) 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, 20387 + ... + 28946.

Almost surely, 2^211145240 is an apocalyptic number.

211145240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211145240 is an abundant number, since it is smaller than the sum of its proper divisors (268381240).

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

211145240 is a wasteful number, since it uses less digits than its factorization.

211145240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49451 (or 49447 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 211145240 is about 14530.8375532865. The cubic root of 211145240 is about 595.4707476719.

Adding to 211145240 its reverse (42541112), we get a palindrome (253686352).

The spelling of 211145240 in words is "two hundred eleven million, one hundred forty-five thousand, two hundred forty".