2001222221213 has 64 divisors (see below), whose sum is σ = 2324754432000. Its totient is φ = 1710120729600.

The previous prime is 2001222221209. The next prime is 2001222221237. The reversal of 2001222221213 is 3121222221002.

It is a cyclic number.

It is not a de Polignac number, because 2001222221213 - 2² = 2001222221209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001222221513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 641621468 + ... + 641624586.

It is an arithmetic number, because the mean of its divisors is an integer number (36324288000).

Almost surely, 2^{2001222221213} is an apocalyptic number.

It is an amenable number.

2001222221213 is a deficient number, since it is larger than the sum of its proper divisors (323532210787).

2001222221213 is a wasteful number, since it uses less digits than its factorization.

2001222221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2001222221213 its reverse (3121222221002), we get a palindrome (5122444442215).

The spelling of 2001222221213 in words is "two trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred thirteen".