21805474360293 has 12 divisors (see below), whose sum is σ = 33919626782860. Its totient is φ = 13418753452416.

The previous prime is 21805474360291. The next prime is 21805474360309. The reversal of 21805474360293 is 39206347450812.

21805474360293 is a `hidden beast` number, since 2 + 1 + 8 + 0 + 547 + 4 + 3 + 6 + 0 + 2 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2146687964964 + 19658786395329 = 1465158^2 + 4433823^2 .

It is not a de Polignac number, because 21805474360293 - 2¹ = 21805474360291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21805474360291) 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, 93185787748 + ... + 93185787981.

It is a 3-persistent number, because k⋅21805474360293 is pandigital for 1 ≤ k ≤ 3, but not for k = 4.

Almost surely, 2^{21805474360293} is an apocalyptic number.

It is an amenable number.

21805474360293 is a deficient number, since it is larger than the sum of its proper divisors (12114152422567).

21805474360293 is a wasteful number, since it uses less digits than its factorization.

21805474360293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186371575748 (or 186371575745 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 21805474360293 in words is "twenty-one trillion, eight hundred five billion, four hundred seventy-four million, three hundred sixty thousand, two hundred ninety-three".