20181821214 has 8 divisors (see below), whose sum is σ = 40363642440. Its totient is φ = 6727273736.

The previous prime is 20181821203. The next prime is 20181821239. The reversal of 20181821214 is 41212818102.

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

20181821214 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 1681818429 + ... + 1681818440.

It is an arithmetic number, because the mean of its divisors is an integer number (5045455305).

Almost surely, 2^20181821214 is an apocalyptic number.

20181821214 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20181821214 is a wasteful number, since it uses less digits than its factorization.

20181821214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363636874.

The product of its (nonzero) digits is 2048, while the sum is 30.

The spelling of 20181821214 in words is "twenty billion, one hundred eighty-one million, eight hundred twenty-one thousand, two hundred fourteen".