21310123311 has 12 divisors (see below), whose sum is σ = 30833204688. Its totient is φ = 14182787904.

The previous prime is 21310123301. The next prime is 21310123399. The reversal of 21310123311 is 11332101312.

21310123311 is a `hidden beast` number, since 21 + 310 + 1 + 2 + 331 + 1 = 666.

It is not a de Polignac number, because 21310123311 - 2¹⁹ = 21309599023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310123301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1991115 + ... + 2001788.

It is an arithmetic number, because the mean of its divisors is an integer number (2569433724).

Almost surely, 2^21310123311 is an apocalyptic number.

21310123311 is a deficient number, since it is larger than the sum of its proper divisors (9523081377).

21310123311 is a wasteful number, since it uses less digits than its factorization.

21310123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993502 (or 3993499 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21310123311 its reverse (11332101312), we get a palindrome (32642224623).

The spelling of 21310123311 in words is "twenty-one billion, three hundred ten million, one hundred twenty-three thousand, three hundred eleven".