211226540 has 48 divisors (see below), whose sum is σ = 509048064. Its totient is φ = 72120000.

The previous prime is 211226539. The next prime is 211226567. The reversal of 211226540 is 45622112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32135 + ... + 38145.

It is an arithmetic number, because the mean of its divisors is an integer number (10605168).

Almost surely, 2^211226540 is an apocalyptic number.

211226540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211226540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254524032).

211226540 is an abundant number, since it is smaller than the sum of its proper divisors (297821524).

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

211226540 is a wasteful number, since it uses less digits than its factorization.

211226540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6278 (or 6276 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 211226540 is about 14533.6347828064. The cubic root of 211226540 is about 595.5471651489.

Adding to 211226540 its reverse (45622112), we get a palindrome (256848652).

The spelling of 211226540 in words is "two hundred eleven million, two hundred twenty-six thousand, five hundred forty".