21312310312111 has 16 divisors (see below), whose sum is σ = 26230647037504. Its totient is φ = 16862415750144.

The previous prime is 21312310312099. The next prime is 21312310312133. The reversal of 21312310312111 is 11121301321312.

It is a cyclic number.

It is not a de Polignac number, because 21312310312111 - 2²⁹ = 21311773441199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312310312151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34706335 + ... + 35315071.

It is an arithmetic number, because the mean of its divisors is an integer number (1639415439844).

Almost surely, 2^{21312310312111} is an apocalyptic number.

21312310312111 is a deficient number, since it is larger than the sum of its proper divisors (4918336725393).

21312310312111 is a wasteful number, since it uses less digits than its factorization.

21312310312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993490.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21312310312111 its reverse (11121301321312), we get a palindrome (32433611633423).

The spelling of 21312310312111 in words is "twenty-one trillion, three hundred twelve billion, three hundred ten million, three hundred twelve thousand, one hundred eleven".