2123005511 has 8 divisors (see below), whose sum is σ = 2337652224. Its totient is φ = 1911966520.

The previous prime is 2123005481. The next prime is 2123005513. The reversal of 2123005511 is 1155003212.

It is a happy number.

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 2123005511 - 2¹⁸ = 2122743367 is a prime.

It is a super-2 number, since 2×2123005511² = 9014304799472742242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123005513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900695 + ... + 903048.

It is an arithmetic number, because the mean of its divisors is an integer number (292206528).

Almost surely, 2^2123005511 is an apocalyptic number.

2123005511 is a deficient number, since it is larger than the sum of its proper divisors (214646713).

2123005511 is a wasteful number, since it uses less digits than its factorization.

2123005511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803861.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2123005511 is about 46076.0839373313. The cubic root of 2123005511 is about 1285.2384425323.

Adding to 2123005511 its reverse (1155003212), we get a palindrome (3278008723).

The spelling of 2123005511 in words is "two billion, one hundred twenty-three million, five thousand, five hundred eleven".