2001212221111 has 8 divisors (see below), whose sum is σ = 2006149708800. Its totient is φ = 1996276626552.

The previous prime is 2001212221061. The next prime is 2001212221121. The reversal of 2001212221111 is 1111222121002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001212221111 - 2³⁷ = 1863773267639 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 (2001212221121) 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 7 ways as a sum of consecutive naturals, for example, 1655296 + ... + 2596618.

It is an arithmetic number, because the mean of its divisors is an integer number (250768713600).

Almost surely, 2^{2001212221111} is an apocalyptic number.

2001212221111 is a deficient number, since it is larger than the sum of its proper divisors (4937487689).

2001212221111 is an equidigital number, since it uses as much as digits as its factorization.

2001212221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946565.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2001212221111 its reverse (1111222121002), we get a palindrome (3112434342113).

The spelling of 2001212221111 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".