21372774728193 has 48 divisors (see below), whose sum is σ = 35365797750400. Its totient is φ = 12184055769600.

The previous prime is 21372774728191. The next prime is 21372774728267. The reversal of 21372774728193 is 39182747727312.

21372774728193 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 2 + 77 + 472 + 8 + 1 + 93 = 666.

It is not a de Polignac number, because 21372774728193 - 2¹ = 21372774728191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21372774728193.

It is not an unprimeable number, because it can be changed into a prime (21372774728191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44624793 + ... + 45101193.

Almost surely, 2^{21372774728193} is an apocalyptic number.

It is an amenable number.

21372774728193 is a deficient number, since it is larger than the sum of its proper divisors (13993023022207).

21372774728193 is a wasteful number, since it uses less digits than its factorization.

21372774728193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478102 (or 478099 counting only the distinct ones).

The product of its digits is 49787136, while the sum is 63.

The spelling of 21372774728193 in words is "twenty-one trillion, three hundred seventy-two billion, seven hundred seventy-four million, seven hundred twenty-eight thousand, one hundred ninety-three".