221787852489 has 16 divisors (see below), whose sum is σ = 375513824640. Its totient is φ = 126735915600.

The previous prime is 221787852487. The next prime is 221787852557. The reversal of 221787852489 is 984258787122.

221787852489 is a `hidden beast` number, since 2 + 2 + 1 + 78 + 7 + 85 + 2 + 489 = 666.

221787852489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221787852489 - 2¹ = 221787852487 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (221787852487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586740162 + ... + 586740539.

It is an arithmetic number, because the mean of its divisors is an integer number (23469614040).

Almost surely, 2^221787852489 is an apocalyptic number.

It is an amenable number.

221787852489 is a deficient number, since it is larger than the sum of its proper divisors (153725972151).

221787852489 is a wasteful number, since it uses less digits than its factorization.

221787852489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173480717 (or 1173480711 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 221787852489 in words is "two hundred twenty-one billion, seven hundred eighty-seven million, eight hundred fifty-two thousand, four hundred eighty-nine".