2123021011 has 4 divisors (see below), whose sum is σ = 2123134624. Its totient is φ = 2122907400.

The previous prime is 2123020997. The next prime is 2123021029. The reversal of 2123021011 is 1101203212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123020982 and 2123021000.

It is not an unprimeable number, because it can be changed into a prime (2123021071) 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 3 ways as a sum of consecutive naturals, for example, 21435 + ... + 68596.

It is an arithmetic number, because the mean of its divisors is an integer number (530783656).

Almost surely, 2^2123021011 is an apocalyptic number.

2123021011 is a deficient number, since it is larger than the sum of its proper divisors (113613).

2123021011 is an equidigital number, since it uses as much as digits as its factorization.

2123021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113612.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2123021011 is about 46076.2521370825. The cubic root of 2123021011 is about 1285.2415703539.

Adding to 2123021011 its reverse (1101203212), we get a palindrome (3224224223).

The spelling of 2123021011 in words is "two billion, one hundred twenty-three million, twenty-one thousand, eleven".