21111312033231 has 96 divisors (see below), whose sum is σ = 34074699079680. Its totient is φ = 11583652953600.

The previous prime is 21111312033199. The next prime is 21111312033271. The reversal of 21111312033231 is 13233021311112.

It is not a de Polignac number, because 21111312033231 - 2⁵ = 21111312033199 is a prime.

It is a super-2 number, since 2×21111312033231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111312033271) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 150864226 + ... + 151004096.

It is an arithmetic number, because the mean of its divisors is an integer number (354944782080).

Almost surely, 2^{21111312033231} is an apocalyptic number.

21111312033231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21111312033231 is a deficient number, since it is larger than the sum of its proper divisors (12963387046449).

21111312033231 is a wasteful number, since it uses less digits than its factorization.

21111312033231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140325 (or 140318 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21111312033231 its reverse (13233021311112), we get a palindrome (34344333344343).

The spelling of 21111312033231 in words is "twenty-one trillion, one hundred eleven billion, three hundred twelve million, thirty-three thousand, two hundred thirty-one".