2123402311 has 4 divisors (see below), whose sum is σ = 2123677912. Its totient is φ = 2123126712.

The previous prime is 2123402293. The next prime is 2123402327. The reversal of 2123402311 is 1132043212.

It is a happy number.

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 2123402311 - 2⁵ = 2123402279 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 (2123402111) 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, 125901 + ... + 141766.

It is an arithmetic number, because the mean of its divisors is an integer number (530919478).

Almost surely, 2^2123402311 is an apocalyptic number.

2123402311 is a deficient number, since it is larger than the sum of its proper divisors (275601).

2123402311 is an equidigital number, since it uses as much as digits as its factorization.

2123402311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275600.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2123402311 is about 46080.3896576407. The cubic root of 2123402311 is about 1285.3185099716.

Adding to 2123402311 its reverse (1132043212), we get a palindrome (3255445523).

The spelling of 2123402311 in words is "two billion, one hundred twenty-three million, four hundred two thousand, three hundred eleven".