18821010 has 32 divisors (see below), whose sum is σ = 48646080. Its totient is φ = 4632768.

The previous prime is 18820993. The next prime is 18821021. The reversal of 18821010 is 1012881.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23740 + ... + 24519.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^18821010 is an apocalyptic number.

18821010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18821010 is an abundant number, since it is smaller than the sum of its proper divisors (29825070).

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

18821010 is a wasteful number, since it uses less digits than its factorization.

18821010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48282.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 18821010 is about 4338.3187987975. The cubic root of 18821010 is about 265.9995948512. Note that the first 3 decimals are identical.

Adding to 18821010 its reverse (1012881), we get a palindrome (19833891).

The spelling of 18821010 in words is "eighteen million, eight hundred twenty-one thousand, ten".