21124400040243 has 24 divisors (see below), whose sum is σ = 30566989274640. Its totient is φ = 14058034859520.

The previous prime is 21124400040223. The next prime is 21124400040283. The reversal of 21124400040243 is 34204000442112.

21124400040243 is a `hidden beast` number, since 2 + 1 + 12 + 4 + 400 + 0 + 4 + 0 + 243 = 666.

It is not a de Polignac number, because 21124400040243 - 2¹⁸ = 21124399778099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124400040223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26933823 + ... + 27707031.

It is an arithmetic number, because the mean of its divisors is an integer number (1273624553110).

Almost surely, 2^{21124400040243} is an apocalyptic number.

21124400040243 is a deficient number, since it is larger than the sum of its proper divisors (9442589234397).

21124400040243 is a wasteful number, since it uses less digits than its factorization.

21124400040243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778579 (or 778576 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21124400040243 its reverse (34204000442112), we get a palindrome (55328400482355).

The spelling of 21124400040243 in words is "twenty-one trillion, one hundred twenty-four billion, four hundred million, forty thousand, two hundred forty-three".