21031022312111 has 4 divisors (see below), whose sum is σ = 24035454070992. Its totient is φ = 18026590553232.

The previous prime is 21031022312099. The next prime is 21031022312159. The reversal of 21031022312111 is 11121322013012.

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 21031022312111 - 2¹⁰ = 21031022311087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031022302111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502215879430 + ... + 1502215879443.

It is an arithmetic number, because the mean of its divisors is an integer number (6008863517748).

Almost surely, 2^{21031022312111} is an apocalyptic number.

21031022312111 is a deficient number, since it is larger than the sum of its proper divisors (3004431758881).

21031022312111 is an equidigital number, since it uses as much as digits as its factorization.

21031022312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004431758880.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21031022312111 its reverse (11121322013012), we get a palindrome (32152344325123).

The spelling of 21031022312111 in words is "twenty-one trillion, thirty-one billion, twenty-two million, three hundred twelve thousand, one hundred eleven".