21012440331231 has 12 divisors (see below), whose sum is σ = 30438269188600. Its totient is φ = 13968155175120.

The previous prime is 21012440331209. The next prime is 21012440331241. The reversal of 21012440331231 is 13213304421012.

21012440331231 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 24 + 403 + 3 + 1 + 231 = 666.

It is not a de Polignac number, because 21012440331231 - 2²⁶ = 21012373222367 is a prime.

It is a super-3 number, since 3×21012440331231³ (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 = 21012440331195 and 21012440331204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012440331241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3344861605 + ... + 3344867886.

Almost surely, 2^{21012440331231} is an apocalyptic number.

21012440331231 is a deficient number, since it is larger than the sum of its proper divisors (9425828857369).

21012440331231 is a wasteful number, since it uses less digits than its factorization.

21012440331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6689729846 (or 6689729843 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21012440331231 its reverse (13213304421012), we get a palindrome (34225744752243).

The spelling of 21012440331231 in words is "twenty-one trillion, twelve billion, four hundred forty million, three hundred thirty-one thousand, two hundred thirty-one".