18821772230 has 32 divisors (see below), whose sum is σ = 34113657600. Its totient is φ = 7476749280.

The previous prime is 18821772161. The next prime is 18821772257. The reversal of 18821772230 is 3227712881.

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 15 ways as a sum of consecutive naturals, for example, 1079885 + ... + 1097175.

It is an arithmetic number, because the mean of its divisors is an integer number (1066051800).

Almost surely, 2^18821772230 is an apocalyptic number.

18821772230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18821772230 is a deficient number, since it is larger than the sum of its proper divisors (15291885370).

18821772230 is a wasteful number, since it uses less digits than its factorization.

18821772230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044.

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 18821772230 in words is "eighteen billion, eight hundred twenty-one million, seven hundred seventy-two thousand, two hundred thirty".