21011112321231 has 16 divisors (see below), whose sum is σ = 28092081464928. Its totient is φ = 13968794112000.

The previous prime is 21011112321229. The next prime is 21011112321293. The reversal of 21011112321231 is 13212321111012.

It is not a de Polignac number, because 21011112321231 - 2¹ = 21011112321229 is a prime.

It is a super-2 number, since 2×21011112321231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011112321198 and 21011112321207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011112321211) 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, 2267871 + ... + 6867711.

It is an arithmetic number, because the mean of its divisors is an integer number (1755755091558).

Almost surely, 2^{21011112321231} is an apocalyptic number.

21011112321231 is a deficient number, since it is larger than the sum of its proper divisors (7080969143697).

21011112321231 is a wasteful number, since it uses less digits than its factorization.

21011112321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604042.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21011112321231 its reverse (13212321111012), we get a palindrome (34223433432243).

The spelling of 21011112321231 in words is "twenty-one trillion, eleven billion, one hundred twelve million, three hundred twenty-one thousand, two hundred thirty-one".