19824242891 has 4 divisors (see below), whose sum is σ = 19950512112. Its totient is φ = 19697973672.

The previous prime is 19824242887. The next prime is 19824242899.

19824242891 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19824242891 - 2² = 19824242887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19824242899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63134375 + ... + 63134688.

It is an arithmetic number, because the mean of its divisors is an integer number (4987628028).

Almost surely, 2^19824242891 is an apocalyptic number.

19824242891 is a deficient number, since it is larger than the sum of its proper divisors (126269221).

19824242891 is a wasteful number, since it uses less digits than its factorization.

19824242891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126269220.

The product of its digits is 663552, while the sum is 50.

The spelling of 19824242891 in words is "nineteen billion, eight hundred twenty-four million, two hundred forty-two thousand, eight hundred ninety-one".