212130001 has 4 divisors (see below), whose sum is σ = 215607604. Its totient is φ = 208652400.

The previous prime is 212129977. The next prime is 212130007. The reversal of 212130001 is 100031212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51854401 + 160275600 = 7201^2 + 12660^2 .

It is a cyclic number.

It is not a de Polignac number, because 212130001 - 2⁵ = 212129969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212130001.

It is not an unprimeable number, because it can be changed into a prime (212130007) 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, 1738710 + ... + 1738831.

It is an arithmetic number, because the mean of its divisors is an integer number (53901901).

Almost surely, 2^212130001 is an apocalyptic number.

It is an amenable number.

212130001 is a deficient number, since it is larger than the sum of its proper divisors (3477603).

212130001 is an equidigital number, since it uses as much as digits as its factorization.

212130001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477602.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 212130001 is about 14564.6833470556. The cubic root of 212130001 is about 596.3950515488.

Adding to 212130001 its reverse (100031212), we get a palindrome (312161213).

The spelling of 212130001 in words is "two hundred twelve million, one hundred thirty thousand, one".