21012231333231 has 6 divisors (see below), whose sum is σ = 30351000814680. Its totient is φ = 14008154222148.

The previous prime is 21012231333209. The next prime is 21012231333293. The reversal of 21012231333231 is 13233313221012.

21012231333231 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 22 + 313 + 3 + 323 + 1 = 666.

It is not a de Polignac number, because 21012231333231 - 2⁶ = 21012231333167 is a prime.

It is a super-2 number, since 2×21012231333231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012231333195 and 21012231333204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012231333931) 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 5 ways as a sum of consecutive naturals, for example, 1167346185171 + ... + 1167346185188.

It is an arithmetic number, because the mean of its divisors is an integer number (5058500135780).

Almost surely, 2^{21012231333231} is an apocalyptic number.

21012231333231 is a deficient number, since it is larger than the sum of its proper divisors (9338769481449).

21012231333231 is a wasteful number, since it uses less digits than its factorization.

21012231333231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334692370365 (or 2334692370362 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21012231333231 its reverse (13233313221012), we get a palindrome (34245544554243).

The spelling of 21012231333231 in words is "twenty-one trillion, twelve billion, two hundred thirty-one million, three hundred thirty-three thousand, two hundred thirty-one".