18782020221 has 16 divisors (see below), whose sum is σ = 25250193408. Its totient is φ = 12417678000.

The previous prime is 18782020211. The next prime is 18782020237. The reversal of 18782020221 is 12202028781.

It is not a de Polignac number, because 18782020221 - 2⁶ = 18782020157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18782020211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1077586 + ... + 1094876.

It is an arithmetic number, because the mean of its divisors is an integer number (1578137088).

Almost surely, 2^18782020221 is an apocalyptic number.

It is an amenable number.

18782020221 is a deficient number, since it is larger than the sum of its proper divisors (6468173187).

18782020221 is a wasteful number, since it uses less digits than its factorization.

18782020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20272.

The product of its (nonzero) digits is 7168, while the sum is 33.

The spelling of 18782020221 in words is "eighteen billion, seven hundred eighty-two million, twenty thousand, two hundred twenty-one".