18619384921 has 8 divisors (see below), whose sum is σ = 18726183680. Its totient is φ = 18512692992.

The previous prime is 18619384919. The next prime is 18619384939. The reversal of 18619384921 is 12948391681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18619384921 - 2¹ = 18619384919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18619384991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336976 + ... + 388318.

It is an arithmetic number, because the mean of its divisors is an integer number (2340772960).

Almost surely, 2^18619384921 is an apocalyptic number.

It is an amenable number.

18619384921 is a deficient number, since it is larger than the sum of its proper divisors (106798759).

18619384921 is a wasteful number, since it uses less digits than its factorization.

18619384921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53415.

The product of its digits is 746496, while the sum is 52.

The spelling of 18619384921 in words is "eighteen billion, six hundred nineteen million, three hundred eighty-four thousand, nine hundred twenty-one".