21031311102231 has 4 divisors (see below), whose sum is σ = 28041748136312. Its totient is φ = 14020874068152.

The previous prime is 21031311102223. The next prime is 21031311102233. The reversal of 21031311102231 is 13220111313012.

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

It is not a de Polignac number, because 21031311102231 - 2³ = 21031311102223 is a prime.

It is a super-3 number, since 3×21031311102231³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031311102198 and 21031311102207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031311102233) 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, 3505218517036 + ... + 3505218517041.

It is an arithmetic number, because the mean of its divisors is an integer number (7010437034078).

Almost surely, 2^{21031311102231} is an apocalyptic number.

21031311102231 is a deficient number, since it is larger than the sum of its proper divisors (7010437034081).

21031311102231 is an equidigital number, since it uses as much as digits as its factorization.

21031311102231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010437034080.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21031311102231 its reverse (13220111313012), we get a palindrome (34251422415243).

The spelling of 21031311102231 in words is "twenty-one trillion, thirty-one billion, three hundred eleven million, one hundred two thousand, two hundred thirty-one".