2001121122223 has 2 divisors, whose sum is σ = 2001121122224. Its totient is φ = 2001121122222.

The previous prime is 2001121122211. The next prime is 2001121122227. The reversal of 2001121122223 is 3222211211002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001121122223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001121122223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001121122227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000560561111 + 1000560561112.

It is an arithmetic number, because the mean of its divisors is an integer number (1000560561112).

Almost surely, 2^{2001121122223} is an apocalyptic number.

2001121122223 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001121122223 is an equidigital number, since it uses as much as digits as its factorization.

2001121122223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2001121122223 its reverse (3222211211002), we get a palindrome (5223332333225).

The spelling of 2001121122223 in words is "two trillion, one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-three".