2001212220201 has 4 divisors (see below), whose sum is σ = 2668282960272. Its totient is φ = 1334141480132.

The previous prime is 2001212220187. The next prime is 2001212220229. The reversal of 2001212220201 is 1020222121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001212220201 - 2¹⁹ = 2001211695913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001212220251) 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, 333535370031 + ... + 333535370036.

It is an arithmetic number, because the mean of its divisors is an integer number (667070740068).

Almost surely, 2^{2001212220201} is an apocalyptic number.

It is an amenable number.

2001212220201 is a deficient number, since it is larger than the sum of its proper divisors (667070740071).

2001212220201 is an equidigital number, since it uses as much as digits as its factorization.

2001212220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667070740070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001212220201 its reverse (1020222121002), we get a palindrome (3021434341203).

The spelling of 2001212220201 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty thousand, two hundred one".