218021982 has 24 divisors (see below), whose sum is σ = 448281288. Its totient is φ = 70638480.

The previous prime is 218021959. The next prime is 218021983. The reversal of 218021982 is 289120812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218021983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219507 + ... + 220497.

It is an arithmetic number, because the mean of its divisors is an integer number (18678387).

Almost surely, 2^218021982 is an apocalyptic number.

218021982 is an abundant number, since it is smaller than the sum of its proper divisors (230259306).

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

218021982 is an frugal number, since it uses more digits than its factorization.

218021982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 218021982 is about 14765.5674459196. The cubic root of 218021982 is about 601.8663938258.

The spelling of 218021982 in words is "two hundred eighteen million, twenty-one thousand, nine hundred eighty-two".