2181320229018 has 128 divisors (see below), whose sum is σ = 5183699189760. Its totient is φ = 598806432000.

The previous prime is 2181320229007. The next prime is 2181320229029. The reversal of 2181320229018 is 8109220231812.

It is an interprime number because it is at equal distance from previous prime (2181320229007) and next prime (2181320229029).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 148695388 + ... + 148710056.

It is an arithmetic number, because the mean of its divisors is an integer number (40497649920).

Almost surely, 2^{2181320229018} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181320229018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2591849594880).

2181320229018 is an abundant number, since it is smaller than the sum of its proper divisors (3002378960742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2181320229018 is a wasteful number, since it uses less digits than its factorization.

2181320229018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15524.

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 2181320229018 in words is "two trillion, one hundred eighty-one billion, three hundred twenty million, two hundred twenty-nine thousand, eighteen".