2001012212201 has 4 divisors (see below), whose sum is σ = 2020824214404. Its totient is φ = 1981200210000.

The previous prime is 2001012212197. The next prime is 2001012212207. The reversal of 2001012212201 is 1022122101002.

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 1865423298025 + 135588914176 = 1365805^2 + 368224^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001012212201 - 2² = 2001012212197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001012212207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9906000950 + ... + 9906001151.

It is an arithmetic number, because the mean of its divisors is an integer number (505206053601).

Almost surely, 2^{2001012212201} is an apocalyptic number.

It is an amenable number.

2001012212201 is a deficient number, since it is larger than the sum of its proper divisors (19812002203).

2001012212201 is a wasteful number, since it uses less digits than its factorization.

2001012212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19812002202.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001012212201 its reverse (1022122101002), we get a palindrome (3023134313203).

The spelling of 2001012212201 in words is "two trillion, one billion, twelve million, two hundred twelve thousand, two hundred one".