212122001 has 16 divisors (see below), whose sum is σ = 261631104. Its totient is φ = 167474304.

The previous prime is 212121989. The next prime is 212122007. The reversal of 212122001 is 100221212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212122001 - 2¹⁰ = 212120977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212122007) 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 15 ways as a sum of consecutive naturals, for example, 45365 + ... + 49821.

It is an arithmetic number, because the mean of its divisors is an integer number (16351944).

Almost surely, 2^212122001 is an apocalyptic number.

It is an amenable number.

212122001 is a deficient number, since it is larger than the sum of its proper divisors (49509103).

212122001 is a wasteful number, since it uses less digits than its factorization.

212122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 212122001 is about 14564.4087075308. The cubic root of 212122001 is about 596.3875542273.

Adding to 212122001 its reverse (100221212), we get a palindrome (312343213).

The spelling of 212122001 in words is "two hundred twelve million, one hundred twenty-two thousand, one".