212025665 has 8 divisors (see below), whose sum is σ = 254819688. Its totient is φ = 169361280.

The previous prime is 212025643. The next prime is 212025701. The reversal of 212025665 is 566520212.

It can be written as a sum of positive squares in 4 ways, for example, as 114233344 + 97792321 = 10688^2 + 9889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212025665 - 2¹⁸ = 211763521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28772 + ... + 35381.

It is an arithmetic number, because the mean of its divisors is an integer number (31852461).

Almost surely, 2^212025665 is an apocalyptic number.

It is an amenable number.

212025665 is a deficient number, since it is larger than the sum of its proper divisors (42794023).

212025665 is an equidigital number, since it uses as much as digits as its factorization.

212025665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64819.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 212025665 is about 14561.1010916070. The cubic root of 212025665 is about 596.2972566770.

Adding to 212025665 its reverse (566520212), we get a palindrome (778545877).

The spelling of 212025665 in words is "two hundred twelve million, twenty-five thousand, six hundred sixty-five".