18221079071 has 4 divisors (see below), whose sum is σ = 19622700552. Its totient is φ = 16819457592.

The previous prime is 18221079047. The next prime is 18221079073. The reversal of 18221079071 is 17097012281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17097012281 = 37 ⋅462081413.

It is a cyclic number.

It is not a de Polignac number, because 18221079071 - 2¹⁰ = 18221078047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221079073) 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 3 ways as a sum of consecutive naturals, for example, 700810721 + ... + 700810746.

It is an arithmetic number, because the mean of its divisors is an integer number (4905675138).

Almost surely, 2^18221079071 is an apocalyptic number.

18221079071 is a deficient number, since it is larger than the sum of its proper divisors (1401621481).

18221079071 is a wasteful number, since it uses less digits than its factorization.

18221079071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401621480.

The product of its (nonzero) digits is 14112, while the sum is 38.

The spelling of 18221079071 in words is "eighteen billion, two hundred twenty-one million, seventy-nine thousand, seventy-one".