2001211211213 has 4 divisors (see below), whose sum is σ = 2001279186588. Its totient is φ = 2001143235840.

The previous prime is 2001211211171. The next prime is 2001211211239. The reversal of 2001211211213 is 3121121121002.

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 1193508180484 + 807703030729 = 1092478^2 + 898723^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001211211213 - 2²² = 2001207016909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001211211191 and 2001211211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001211214213) 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, 33943508 + ... + 34002413.

It is an arithmetic number, because the mean of its divisors is an integer number (500319796647).

Almost surely, 2^{2001211211213} is an apocalyptic number.

It is an amenable number.

2001211211213 is a deficient number, since it is larger than the sum of its proper divisors (67975375).

2001211211213 is an equidigital number, since it uses as much as digits as its factorization.

2001211211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67975374.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2001211211213 its reverse (3121121121002), we get a palindrome (5122332332215).

The spelling of 2001211211213 in words is "two trillion, one billion, two hundred eleven million, two hundred eleven thousand, two hundred thirteen".