211147730 has 16 divisors (see below), whose sum is σ = 382489560. Its totient is φ = 83920512.

The previous prime is 211147723. The next prime is 211147733. The reversal of 211147730 is 37741112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 174266401 + 36881329 = 13201^2 + 6073^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211147730.

It is not an unprimeable number, because it can be changed into a prime (211147733) 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, 65675 + ... + 68814.

Almost surely, 2^211147730 is an apocalyptic number.

211147730 is a deficient number, since it is larger than the sum of its proper divisors (171341830).

211147730 is a wasteful number, since it uses less digits than its factorization.

211147730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134653.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 211147730 is about 14530.9232328851. The cubic root of 211147730 is about 595.4730884246.

Adding to 211147730 its reverse (37741112), we get a palindrome (248888842).

The spelling of 211147730 in words is "two hundred eleven million, one hundred forty-seven thousand, seven hundred thirty".