21131211322231 has 8 divisors (see below), whose sum is σ = 21242613319200. Its totient is φ = 21019861475712.

The previous prime is 21131211322187. The next prime is 21131211322237. The reversal of 21131211322231 is 13222311213112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131211322231 - 2⁷ = 21131211322103 is a prime.

It is a super-2 number, since 2×21131211322231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131211322196 and 21131211322205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131211322237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12224950 + ... + 13846003.

It is an arithmetic number, because the mean of its divisors is an integer number (2655326664900).

Almost surely, 2^{21131211322231} is an apocalyptic number.

21131211322231 is a deficient number, since it is larger than the sum of its proper divisors (111401996969).

21131211322231 is a wasteful number, since it uses less digits than its factorization.

21131211322231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26075225.

The product of its digits is 864, while the sum is 25.

Adding to 21131211322231 its reverse (13222311213112), we get a palindrome (34353522535343).

The spelling of 21131211322231 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred eleven million, three hundred twenty-two thousand, two hundred thirty-one".