21506073174369 has 48 divisors (see below), whose sum is σ = 36105044220544. Its totient is φ = 12080703398400.

The previous prime is 21506073174343. The next prime is 21506073174403. The reversal of 21506073174369 is 96347137060512.

21506073174369 is a `hidden beast` number, since 2 + 1 + 50 + 60 + 7 + 3 + 174 + 369 = 666.

It is not a de Polignac number, because 21506073174369 - 2¹⁷ = 21506073043297 is a prime.

It is a super-2 number, since 2×21506073174369² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21506073176369) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4997529 + ... + 8245449.

Almost surely, 2^{21506073174369} is an apocalyptic number.

It is an amenable number.

21506073174369 is a deficient number, since it is larger than the sum of its proper divisors (14598971046175).

21506073174369 is a wasteful number, since it uses less digits than its factorization.

21506073174369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249718 (or 3249715 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 21506073174369 in words is "twenty-one trillion, five hundred six billion, seventy-three million, one hundred seventy-four thousand, three hundred sixty-nine".