212212222001 has 4 divisors (see below), whose sum is σ = 228536239092. Its totient is φ = 195888204912.

The previous prime is 212212221961. The next prime is 212212222003. The reversal of 212212222001 is 100222212212.

It is a happy number.

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 44026110976 + 168186111025 = 209824^2 + 410105^2 .

It is a cyclic number.

It is not a de Polignac number, because 212212222001 - 2⁶ = 212212221937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212212222003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8162008526 + ... + 8162008551.

It is an arithmetic number, because the mean of its divisors is an integer number (57134059773).

Almost surely, 2^212212222001 is an apocalyptic number.

It is an amenable number.

212212222001 is a deficient number, since it is larger than the sum of its proper divisors (16324017091).

212212222001 is a wasteful number, since it uses less digits than its factorization.

212212222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16324017090.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212212222001 its reverse (100222212212), we get a palindrome (312434434213).

The spelling of 212212222001 in words is "two hundred twelve billion, two hundred twelve million, two hundred twenty-two thousand, one".