2102123311 has 4 divisors (see below), whose sum is σ = 2212761400. Its totient is φ = 1991485224.

The previous prime is 2102123281. The next prime is 2102123323. The reversal of 2102123311 is 1133212012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2102123311 - 2⁵ = 2102123279 is a prime.

It is a super-3 number, since 3×2102123311³ (a number of 29 digits) contains 333 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 (2102123351) 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, 55319016 + ... + 55319053.

It is an arithmetic number, because the mean of its divisors is an integer number (553190350).

Almost surely, 2^2102123311 is an apocalyptic number.

2102123311 is a deficient number, since it is larger than the sum of its proper divisors (110638089).

2102123311 is a wasteful number, since it uses less digits than its factorization.

2102123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110638088.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2102123311 is about 45848.9183187564. The cubic root of 2102123311 is about 1281.0106176740.

Adding to 2102123311 its reverse (1133212012), we get a palindrome (3235335323).

The spelling of 2102123311 in words is "two billion, one hundred two million, one hundred twenty-three thousand, three hundred eleven".